[POV Era]

  The orange trail that only I could see slithered through the university gardens, crossing pzas where weeds were already reciming the concrete. We walked in silence, but while my system processed the route with ser-like efficiency, the outside world began to change. The purple sky sank into an almost bck indigo tone, and the shadows of the buildings stretched across the ground like cws.

  For me, darkness was no obstacle; my eyes simply adjusted their light gain, revealing the surroundings in perfect crity of gray and golden hues. That was why it took me too long to realize that Chelsea’s pace had changed.

  I stopped and turned to ask her if she recognized the next building, but the words caught in my processor. Chelsea was several meters behind me. Her usually pale face was covered in a sheen of cold sweat under the moonlight. She was breathing with difficulty, shoulders slumped, one hand pressed against a brick wall to keep from falling.

  "Chelsea…" I said, my synthetic voice breaking the silence. "You’re exhausted."

  She lifted her head, trying to force a smile that never reached her eyes. Her bangs clung to her face, stuck to her forehead with sweat.

  "I’m… fine. It’s just… a bit of tiredness. We can keep going… a couple more kilometers," she stammered, but her knees visibly trembled.

  It was a reality check. My system did not know fatigue. I could run for a hundred hours without my servomotors compining, but Chelsea was biological. She was flesh, bone, and lungs that needed oxygen and rest. We had been walking for hours at a pace that, for me, was a stroll—but for her, it was a forced march.

  "No," I said firmly, stepping closer to her. "I made a miscalcution. You’re human, Chelsea. Your body has limits that I… that I tend to forget."

  "I don’t want to slow you down, Era. Sora could be close," she murmured, her voice barely a thread.

  "We won’t find her if you colpse in the middle of the street," I replied. I looked around. To our right rose the wing of an old student residence hall. It looked intact enough. "We’ll rest there."

  Before she could protest, I stepped in front of her and turned my back to her.

  "Get on," I ordered.

  "What? No, Era, I can walk, I—"

  "It’s an order, Chelsea. I’m not going to let you pass out."

  With a gesture of surprise and shyness, she wrapped her arms around my neck and shifted her weight onto my back. When I lifted her, my system didn’t even register a significant increase in workload. It was like carrying a backpack full of feathers. Chelsea let out a small breath of amazement as, in one smooth motion, I started moving.

  "You’re so… solid," she whispered near my ear. "And you’re cold. Like you’re made of marble."

  I didn’t respond. I entered the residence building, took the stairs two at a time without my nonexistent breathing changing, and explored the second floor. I found a room whose door was still on its hinges. Inside, to my relief, there was a bed with a mattress that seemed to have avoided the damp.

  I set Chelsea down on the bed carefully. She sank into the mattress with a sigh of pure relief, her muscles finally rexing after months of constant tension. I went to my backpack, took out one of the food cans I had collected at the supermarket, and handed it to her along with a bottle of water.

  "Eat. You need to regain energy," I said, sitting down on a nearby wooden chair.

  While Chelsea ate eagerly, the silence of the room allowed my mind to sink into a problem that had been circling me since I met her. Why was she here? Why was the man at the shelter still conscious? Why had I myself, before becoming Era, not been “harvested” immediately where I fell?

  "System," I called internally. "Initiate a comparative analysis. I need to understand why certain biological subjects show immunity or resistance to the initial neutralization frequency."

  <[RESPONSE: INSUFFICIENT DATA. BIOMETRIC SCAN OF A NEARBY IMMUNE SUBJECT RECOMMENDED.]>

  I looked at Chelsea. She was distracted by her food, staring out the broken window with a thoughtful expression. I felt a spike of nervousness I shouldn’t have had. For a deep scan, Orion thought I would have to touch her—pce my hands on her head or do something invasive that would scare her again.

  "Do I have to… touch her?" I asked.

  <[NEGATIVE. HIGH-RESOLUTION OPTICAL SENSORS CAN PERFORM DEEP PENETRATION SCANNING VIA SPECTROMETRY AND PASSIVE X-RAYS. MAINTAIN VISUAL CONTACT WITH THE SUBJECT.]>

  "Chelsea," I said, trying to sound casual, "stay still for a moment. You’ve got something on your face."

  She froze, a piece of food halfway to her mouth, looking at me with curiosity.

  "What? A bug?" she asked, worried.

  "Don’t move," I insisted.

  In my vision, the world changed. A cyan-blue rectangur frame closed around Chelsea’s figure. A counter appeared at the center of my retina: [SCANNING: 5… 4… 3…]. A light invisible to the human eye swept over her body, analyzing bone density, blood flow, and molecur composition.

  [2… 1… SCAN COMPLETE.]

  A data screen unfolded before me. I saw Chelsea’s skeleton, her organs pulsing in a healthy orange tone. Everything looked normal for a human under stress… until the scanner paused at her left arm, near the elbow.

  There, the system highlighted three thin metallic objects.

  <[FOREIGN MATERIAL DETECTED: SURGICAL TITANIUM ALLOY. FUNCTION: POST-TRAUMATIC BONE STABILIZATION (PRIOR SURGERY).]>

  "You have a pte in your arm," I said, not realizing I had spoken out loud.

  Chelsea blinked and touched her left elbow with a bitter smile.

  "Oh, that. Yeah. I broke my arm in three pces when I was a kid, riding a bike. It was a bad fall. They had to put in some pins and a metal pte so the bone would heal properly. How do you know that? Do you have X-ray vision or something?"

  Her tone was joking, but her eyes searched for an answer.

  "I have… good instincts for anatomy," I lied, looking away. "It’s an interesting curiosity."

  Inside me, my processor was working at full speed. A hypothesis began to take shape, fed by system data.

  "System, is it possible that metallic impnts of certain densities act as a lightning rod or a disruptor for the neutralization frequency?" I asked.

  <[PROBABLE HYPOTHESIS: THE NEUTRALIZATION WAVE OPERATES AT A SPECIFIC ELECTROMAGNETIC FREQUENCY THAT AFFECTS BIOLOGICAL NEURAL TISSUE. THE PRESENCE OF METALLIC ALLOYS WITHIN THE BODY CAN CREATE FIELD INTERFERENCE, ACTING AS A LOCALIZED ‘FARADAY CAGE’ OR SIGNAL DISSIPATOR.]>

  I fell into thought. It wasn’t biological immunity. It was a technical coincidence. Chelsea was awake because a childhood accident had left her with a piece of metal that interfered with the alien weapon. A cruel irony: an old injury had saved her from the end of the world.

  I looked at Chelsea, who was now settling in to sleep. She didn’t know she was a statistical anomaly.

  "Sleep, Chelsea," I said softly. "I’ll keep watch. Tomorrow we’ll continue following Sora’s trail."

  "Thank you, Era… for everything," she murmured before closing her eyes.

  I stayed seated in the darkness, watching her. The discovery gave me a new perspective. If immunity was caused by metallic interference, it meant there were more people like her. People with prosthetics, pacemakers, dental ptes… accidental survivors scattered across the world.

  But it also meant the invaders were not infallible. Their technology had a fw, a blind spot they hadn’t anticipated. And as the clock in my head continued counting down the minutes toward zero, that small weakness in their pn felt like the first crack in a wall I was destined to tear down.

  "Ninety-four hours," I whispered to myself. The countdown continued, but now, for the first time, I had an idea of why the game board wasn’t as empty as they wanted it to be.