The patrol had been routine for three hours. Even so, Valoris's enhanced awareness itched with wrongness despite nothing being objectively concerning. Zone 12-Gamma spread around them in familiar distortion, reality bent into shapes that hurt to perceive even through Paragon's sensors, colors shifted into spectrums that made her consciousness ache.

  Fourth year, fifth month. Twenty-third deployment. A standard patrol checking dimensional stability at sector boundaries, documenting corruption progression rates, monitoring for entity activity. An easy assignment with low risk, the kind of mission they could complete efficiently and return for hot showers and actual sleep.

  Through Paragon's connection, Valoris maintained awareness of her squad's positions. Reaver on point, Zee's aggressive energy barely contained as she led formation. Meridian providing precision overwatch, Saren's military efficiency translating into perfect positioning. Specter phased partially, Quinn existing somewhere between present and absent. Jinx moved with chaotic grace, Milo's constant communication with his mech creating that unsettling partnership.

  "Sector Delta-Four clear," Zee reported, her voice carrying through squad comms. "No entity signatures. Corruption levels stable at previous readings. Moving to Delta-Five."

  "Copy," Valoris confirmed, Paragon following formation at optimal command distance. "Maintain current pace. Specter, any anomalies in phase-space?"

  "Negative." Quinn's voice came back flat and distant, their consciousness mostly elsewhere, existing in dimensional flux where normal perception didn't apply. "Dimensional substrate shows expected distortion patterns but nothing unusual."

  "Jinx's doing great," Milo added cheerfully. "Buddy says everything looks normal. Well, normal for a corruption zone. Abnormal for baseline reality. But normal-abnormal rather than abnormal-abnormal, you know?"

  Valoris did know, which probably said concerning things about how adapted she'd become to corruption zone operations. She pulled up the squad vitals dashboard. Every squad lead checked obsessively after learning that pilots could die from things other than entity combat. Heart rates, oxygen saturation, CO? levels, temperature regulation, neural connection stability. All green. All within acceptable parameters.

  Except.

  She frowned, focusing on Saren's readings. Oxygen saturation at 91%. Not critically low, but lower than her baseline. Lower than it should be during routine patrol when nothing was demanding extra oxygen consumption.

  "Chimera Three, check your O? levels," she said, keeping her voice casual despite the concern settling into her chest. "You're reading ninety-one percent."

  "Hmm?" Saren's response came with an odd lilt that made Valoris's attention sharpen. "Oh, that. Yeah, I noticed. Probably just sensor calibration drift. Happens sometimes with extended immersion."

  The casual dismissal was wrong. Saren didn't dismiss things casually. Saren analyzed, verified, documented, reported with clinical precision. Saren would have already run three diagnostics and cross-referenced her readings against backup sensors before anyone else noticed the discrepancy. The Saren that Valoris knew would never say "probably just" about anything related to life support systems.

  "Run a diagnostic anyway," Valoris said. "Confirm the sensors are functioning correctly."

  "If it'll make you feel better." Saren's tone carried something that sounded almost like indulgence. Like she was humoring an anxious child. "Running now. But I'm telling you, everything feels fine. Better than fine, actually. I feel good today."

  Valoris watched the vitals dashboard. 91% became 89%. Then 87%. Her stomach dropped.

  "Chimera Three, your saturation is dropping," she said, urgency bleeding into her voice despite her efforts to stay calm. "Check your oxygenation system status. Immediately."

  "You worry too much, Val." Saren's voice carried something that sounded almost like warmth. Almost like affection. "It's actually kind of sweet. Has anyone ever told you that? That you're sweet when you're being all protective?"

  The words drenched Valoris in panic like ice water. Sweet. Saren Maddox, who had spent four years maintaining icy professionalism, who expressed approval through marginally less hostile criticism, who had never once offered an unqualified compliment to anyone in Valoris's presence, had just given her a nickname and called her sweet.

  Zee's response was immediate: "What the hell?"

  "Saren doesn't say 'sweet,'" Milo said slowly, his usual cheerfulness replaced with something closer to alarm. "Saren has literally never used that word in four years of knowing her. I don't think Saren believes sweetness exists as a concept."

  85% saturation. Definitely not sensor error. Definitely actual hypoxia, progressing faster than it should, which meant the oxygenation system wasn't just malfunctioning but failing entirely.

  "Meridian, pilot status report," Valoris ordered, hoping Saren's mech might provide more accurate data than Saren herself.

  "Oh, Meridian's fine," Saren answered, her voice carrying a lightness that made Valoris's blood run cold. "Everything's fine. Better than fine, actually. I feel... I feel really good. Like everything is finally clicking into place, you know? Like all the stress I've been carrying just... lifted. Isn't that strange? I can't remember the last time I felt this relaxed."

  "Saren." Zee's voice was sharp. "Listen to yourself. You don't feel relaxed. You don't talk about feelings clicking into place. You're the most tightly wound person I've ever met and I mean that as a compliment."

  "That's such a nice thing to say." Saren sounded genuinely touched. "I don't tell you all enough how much I appreciate you. We should talk about our feelings more. As a squad, I mean. We bottle everything up and that's not healthy."

  83% saturation.

  Valoris felt her heart hammering against her ribs. The environmental hazards lecture played through her memory with crystalline clarity: At 85%, you're measurably impaired. Simple math becomes challenging. Fine motor control deteriorates. Judgment suffers significantly. You will still feel fine. You will insist you're functional. You are wrong.

  Saren was past that threshold and still dropping. And she sounded happy about it. She sounded happier than Valoris had ever heard her.

  "The corruption zone looks almost pretty today," Saren continued, her voice dreamy. "Have you ever noticed how the colors sort of shimmer when the dimensional interference peaks? It's like... like light through water. Or maybe like music made visible. Does that make sense? I feel like I'm finally seeing it properly."

  "It doesn't make sense," Quinn said, their flat voice carrying unusual urgency. "Corruption zones are perceptually hostile. They cause cognitive distress. They don't look pretty. Saren, your brain is lying to you."

  "That's kind of a harsh way to put it." Saren laughed softly. "But I appreciate the honesty. That's what I like about you, Quinn. You always say exactly what you think. We should all be more like that."

  81% saturation. 80%.

  Euphoria, Valoris thought, the word landing in her mind like a death sentence. Hypoxia produces euphoria. You feel good despite objective cognitive failure. Your brain, deprived of oxygen, cannot accurately assess its own status.

  Saren was dying. Saren was dying and she felt wonderful about it.

  "Squad halt," Valoris ordered, her voice coming out harder than she intended. "Meridian, emergency cockpit drain protocol. Authorization Kade-07-01, override code gamma-seven."

  "Override?" Saren laughed again, brighter this time, genuinely amused. "Val, that's so dramatic. I don't need to be drained. I'm performing optimally. Probably the best I've felt on any patrol, honestly. My reflexes feel sharper than usual. My thoughts are really clear. We should keep going. I want to see what Delta-Five looks like today."

  The override code activated despite her protests. Meridian's systems accepted the authorization, recognizing squad lead authority over individual pilot objection. Through Paragon's sensors, Valoris watched perfluorocarbon begin flowing from Meridian's cockpit ports, the liquid level dropping incrementally.

  "No, stop." Saren's voice shifted from light to distressed, confusion bleeding through the artificial calm. "I don't need this. Cancel the drain. Kade, come on, this is unnecessary. I'm telling you I'm fine. Why won't anyone listen to me?"

  "Because you're not fine," Zee said, her voice hard enough to cut steel. "Saren, you just said the corruption zone looks pretty. You called Valoris sweet. You laughed. Twice. You suggested we should talk about our feelings more. You are experiencing severe cognitive impairment and you can't tell."

  "I said we should talk about feelings?" Genuine confusion now, layered under the distress. "That's... I wouldn't... I don't..." Her voice was starting to slur, consonants softening, words running together. "This is ridiculous. I'm completely functional. My performance metrics are excellent. If you'd just check the logs you'd see that I'm operating at peak... at peak..."

  She trailed off. Couldn't complete the thought, couldn't find the word she was looking for or remember what she'd been trying to prove.

  79% saturation. 78%.

  Through squad comms, they could hear Saren's breathing change as the liquid drained past her face level. Ragged gasps came through as her body tried to transition from liquid breathing to air while still submerged from the chest down. Her tracheal port prepared to activate, the mechanical system that would force air into her lungs whether she wanted it or not.

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  "Saren, open your mouth," Milo said, his usual lightness completely gone, replaced with focused urgency. "Let the remaining PFC drain naturally. Equalize pressure. Don't fight the transition."

  "I'm not fighting anything." Her voice came out wet, distorted by liquid still coating her throat. "I don't need... this is... you're all being so..."

  The tracheal port activated with mechanical precision. Saren gasped, the sound violent and reflexive as air pressure hit her trachea directly, bypassing voluntary control, forcing oxygen into lungs that were still half-full of perfluorocarbon. The sound over comms was horrible. Wet. Rattling. Desperate. Like someone drowning in reverse, choking on air instead of water.

  Coughing followed immediately, wracking and violent. Her lungs were trying to expel residual PFC while simultaneously processing air, her respiratory system confused about which medium it should be handling, her body fighting itself in the transition between breathing modes. The sounds were awful. Liquid and gasping and choking, Saren's controlled precision shattered into pure biological desperation.

  Valoris watched her oxygen saturation on the dashboard with her heart in her throat. 77%. 76%. Still dropping even as she breathed air because perfluorocarbon remained in her lungs, because the transition wasn't instantaneous, because her impaired judgment had let the hypoxia progress too far before intervention.

  75%.

  Below 75%, consciousness becomes threatened, Wolff’s voice echoed in Valoris's memory. Risk of seizure, cardiac arrhythmia, permanent brain damage.

  Then 76%. 77%. 79%. The numbers climbed slowly as air replaced liquid, as her lungs cleared and normal respiration resumed. Valoris watched the numbers tick upward and felt something loosen in her chest that she hadn't realized had been clenched so tight.

  More coughing over comms. Violent, wracking sounds that seemed to go on forever. Saren’s body was rejecting the liquid it had been breathing, expelling it in wet heaves that sounded like she was turning herself inside out.

  "Maddox, status," Valoris said once the worst of the coughing subsided, her own voice rougher than she'd expected. “Report.”

  "I..." Saren's voice came out raw, scraped hollow by coughing. "What happened? Why am I drained? We were on patrol. Everything was..." She stopped. Started again. "Everything was fine. I remember… I don’t remember."

  "Check your vitals replay," Valoris said gently. "Review the last fifteen minutes of data."

  Silence on comms for several seconds. Valoris could imagine Saren pulling up the logs, watching her own oxygen saturation drop, listening to recordings of herself saying things she would never say, watching evidence of her own cognitive failure.

  Then: "Oh."

  Just that. A small word carrying enormous weight. Recognition. Horror. Understanding exactly how wrong she'd been while insisting she was right.

  "My O? saturation dropped to seventy-five percent," Saren said slowly, each word careful, like she was checking them against reality before letting them out. "I was approaching consciousness failure. I was minutes from potential brain damage." Her voice cracked. "And I felt good. I felt... I felt happy. I said the corruption zone was pretty. I called you sweet. I suggested we should discuss our feelings."

  "That's hypoxia," Quinn said quietly. "That's what they warned us about. Your brain was oxygen-deprived. It couldn't accurately assess its own status. You felt euphoric while actually approaching system failure."

  "But I was so certain." Something cracked in Saren's voice, vulnerability bleeding through the precision she used as armor. "I was absolutely certain the sensors were wrong and I was performing optimally. I was arguing with all of you while literally suffocating. I thought you were being paranoid. I thought I was the reasonable one." Her breath hitched. "If you hadn't forced the override... if you'd listened to me..."

  She didn't finish the sentence. Didn't need to. They all understood exactly what would have happened. Continued oxygen deprivation. Loss of consciousness while still connected to Meridian. Her mech responding to dying neural signals. Potential crash, potential friendly fire, potential collateral damage from a forty-foot war machine controlled by a seizing brain.

  "Can you pilot dry?" Valoris asked. "We need to get you back to base for equipment repair and medical evaluation."

  "Yes." Saren's voice was steadier now, finding its familiar clinical edge, though it still sounded scraped raw. "Meridian's oxygenation system needs full diagnostic and repair before I re-immerse." A pause. "I'm going to cough the entire way back. There's still PFC in my lungs. I can feel it."

  "That's fine. I’ll call in and Medical will monitor your vitals remotely. Any signs of delayed complications, you stop and we extract you."

  "Copy." Another pause, longer this time. "Kade. Thank you."

  The words sounded strange coming from Saren, who expressed appreciation about as often as she expressed warmth. Which, under normal circumstances, was never. But these weren't normal circumstances. Saren had just experienced her own mind betraying her so completely that she'd described a corruption zone as beautiful while suffocating to death.

  "Don't thank me," Valoris said. "Thank the vitals dashboard. Thank the fact that we've all learned to trust instruments over feelings."

  "I'll thank the dashboard when it can hear me. Right now I'm thanking you." Saren coughed again, wet and rattling. "I'm starting back. Valoris... I'm sorry for arguing. For insisting I was fine. For making you use the override."

  "Don't apologize for something you couldn't control. Just get back safe."

  They watched through their mechs' sensors as Meridian turned and began the journey back to base. The mech moved with the slightly awkward gait that characterized dry piloting, movements rougher without liquid immersion dampening every twitch, without the neural connection flowing through perfluorocarbon to smooth the interface between thought and motion. Still competent, recognizably Saren's piloting style. But diminished. Careful. The movements of someone who no longer trusted their own body.

  "Resume patrol," Valoris ordered once Meridian was safely out of the corruption zone's deepest area. "We have four more sectors to check. Stay vigilant. Monitor your own vitals and each other's. What happened to Saren can happen to any of us."

  "Understood," from Milo.

  "Copy," from Zee.

  "Acknowledged," from Quinn.

  They moved back into formation, four mechs now instead of five, Saren's absence a visible gap in their tactical array. The patrol continued with routine monitoring, sector checks, documentation. No entity activity. No dramatic events.

  But Valoris kept the vitals dashboard prominent in her awareness. She checked oxygen saturation levels obsessively, every few minutes rather than the standard fifteen-minute intervals, watching for the subtle signs that someone else might be experiencing what Saren had. The false confidence. The warmth. The insistence everything was fine while numbers told a different story.

  Wolff’s lecture had been right about everything. Hypoxia made you stupid and happy about it. Made you argue against your own survival with absolute conviction, feeling sharper and clearer while objectively failing. The only defense was external monitoring, squad vigilance, the willingness to force extraction despite protests. Trust in instruments over feelings, in data over perception, in squad assessment over individual certainty.

  Saren had survived because they'd caught it in time. Because Valoris had been watching the vitals dashboard and she’d used override authority despite Saren’s insistence that she was fine. Next time, because statistics guaranteed there would be a next time, she wouldn’t hesitate so long to initiate the forced override.

  They finished patrol two hours later. Mission success by all official metrics, though Valoris couldn't shake the feeling that success was the wrong word for a deployment where one of them had nearly died without knowing it.

  They returned to base as afternoon light slanted across the academy grounds. Saren met them at the mech bay, and the sight of her made Valoris's chest tighten.

  She looked terrible. Exhausted in a bone-deep way that went beyond physical fatigue. Her eyes were red and swollen from coughing, bloodshot from burst capillaries, the whites stained pink. Her pilot suit was damp with sweat from the stress of dry piloting after a hypoxic crisis, clinging to her frame in ways that made her look smaller than usual. Her hair hung in limp strands around her face, sticky with residual PFC that hadn't fully evaporated.

  But she was standing. Functional. Alive.

  "Meridian is cleared for service," she reported quietly, her voice rough as gravel. "Maintenance identified a partial blockage in the circulation system and the redundancy sensor had failed. They're repairing the blockage and replacing all oxygenation monitoring equipment." She paused. "They're writing me up for not catching the maintenance issue during pre-deployment checks."

  "That's not fair," Milo said. "The sensors were malfunctioning. How were you supposed to catch a problem that the diagnostic systems weren't detecting?"

  "I should have noticed anyway." Saren's voice carried the familiar edge of her perfectionism, though it sounded fragile rather than sharp. "I should have checked the physical components manually. I should have verified the circulation flow rates against baseline. I should have been more thorough."

  "We all should have noticed," Valoris said. "That's on me as squad lead. I'm responsible for confirming everyone's equipment is functional before deployment."

  "Shared responsibility," Zee added. "We all checked our own systems. We all trusted maintenance logs. Doesn't help to assign individual blame when the system failed collectively."

  They stood together in the mech bay, processing what had happened. The space smelled like machine oil and dimensional residue, familiar scents that usually meant homecoming. Today they felt different. Sharper. A reminder that this place they returned to was built on the assumption that some of them wouldn't always come back.

  "I owe you an apology," Saren said after several seconds of silence. "For arguing. For not trusting the override. For being so absolutely certain I was right when I was so completely wrong."

  "Don't apologize," Valoris said firmly. "That's what hypoxia does. You didn't choose to be impaired. You didn't choose to have false confidence. Your brain chemistry was compromised in a way that specifically prevented you from recognizing the compromise. The only failure would have been if we'd listened to your protests instead of the data."

  "I still feel like I failed you." Saren's voice was smaller than Valoris had ever heard it. "I trusted myself over my squad. I argued against people trying to save my life. I called you sweet, Kade. I apparently suggested we should discuss our feelings more often." She shuddered. "I don't remember saying that. But the logs confirm it."

  "You survived," Zee said. "And learned. And you’ll trust overrides in the future. That's not failure. That's being a pilot who's smarter tomorrow than today."

  "We all learned," Milo added quietly. "We confirmed that we need to trust instruments over feelings, even when our feelings are insisting that everything is fine."

  "Speak for yourself about the lesson being worth the scare." Some of Saren's usual dry precision crept back into her voice. "I'm going to be examining my own thought patterns obsessively for weeks. Every time I feel confident about something, I'll be wondering if my confidence is real or if my brain is lying to me again." She looked down at her hands, still trembling slightly. "The memory of being absolutely certain I was fine while literally suffocating... I don't know how to process that. I don't know how to trust myself anymore."

  "You process it by trusting your squad," Quinn said, their flat voice carrying something that might have been gentleness. "That fear you're feeling will keep you alive. Comfortable confidence kills pilots. Healthy paranoia about your own perception keeps them functional. But we all watch out for each other."

  Saren nodded slowly, processing that. Then she looked up at each of them in turn, her expression vulnerable in a way Valoris had never seen from her before.

  "Thank you," she said again. "All of you."

  "That's what squads do," Valoris said simply.

  They moved toward decontamination together with another deployment completed and another lesson learned in ways that theory could never teach.