10:50 AM. Day 16.
The corridor narrowed. They'd left the north stairwell and entered a section Jae-min didn't recognize — walls closer together, ceiling lower, debris from collapsed ductwork blocking the left side entirely. The group compressed into single file along the right wall.
The cold was different here. Not warmer — nothing in this building was warmer — but still. The wind from the breaches didn't reach this section as directly. The air was dead and heavy and tasted like frozen concrete.
Uncle at the front. Then the able-bodied carrying and supporting priority cases. Then the children between adults. Then Jae-min at the rear, frozen left hand tucked against his chest, right hand trailing the wall for balance. The floor was a sheet of ice — thin enough to see concrete beneath, thick enough to make every step uncertain. Two people had already slipped. Neither fell. Both lost ten seconds catching themselves.
Yue was ahead, three bodies back from the front. She hadn't spoken since the stairwell. Her good hand braced against the wall, eyes moving in a slow systematic sweep — floor, walls, ceiling, floor.
She stopped.
"Something's off."
Uncle paused. The line behind him compressed.
"Frost pattern." Her voice was low. "There's a section ahead where the frost is disturbed. Footprints. Recent. One person. Moving toward the north junction."
The building had been evacuated. The residents were behind them. Victor was outside. The Archbishop's people were at the south gap. Nobody should be ahead of them. But the frost didn't lie.
"Continue. Slow."
The corridor turned left at a structural junction — thick concrete pillar at the center, section of intact insulation still clinging to the northern face. The spot Uncle had identified as their next stop. Less cold. No external exposure.
They entered and stopped.
Someone was already there.
He stood against the north wall where the insulation blocked the worst of the draft. Not hiding, not crouched, not armed. Standing with his back to the wall and his arms crossed, watching them arrive with the expression of a man who'd been waiting for something he'd expected to find.
Middle-aged. Lean. Short dark hair, grey at the temples. Narrow, weathered face — the kind that had spent time outdoors in conditions that left marks. He wore a heavy coat that looked military but wasn't. His boots were civilian. His hands were bare, and they weren't shaking.
He'd been in the cold long enough to adapt. That meant he'd been here before the temperature dropped, or he had resources they didn't.
Uncle's hand went to his sidearm. Not drawn. Ready. The civilians compressed behind him. Children pulled to the center.
The man looked at them. His eyes moved across the group slowly — counting, assessing. He noted the injuries. The frozen hands. The woman being supported. The child being carried. The locked knee. He took it all in without expression, the way a mechanic looks at an engine that's been driven too hard.
"You shouldn't be here."
Flat. Not hostile. Not friendly. Just fact.
Nobody responded.
"You're not from here." A pause. "You're not surviving this building either."
He didn't say it to help. He said it the way someone reads a diagnosis — without emotion, without cruelty.
"Who are you?" Uncle's voice was low. Controlled.
The man didn't answer. Instead he shifted two steps to the left — a small, casual movement into the dead zone where the draft didn't reach. He knew where the cold moved and where it didn't. That wasn't intuition. That was experience.
"Your group has frostbite cases, at least two mobility-limited, and one critical who needs proper treatment within the hour." His eyes moved to the center of the cluster, where Ji-yoo was being carried with the careful support that meant she couldn't support herself. "If you stay in this building, the critical one dies first. Then the immobile ones. Then the rest."
Uncle's jaw tightened. "You've been here the whole time."
The man looked at the ceiling — cracked ductwork, fallen insulation, frost spreading across concrete. His expression didn't change.
"There's nothing left for you here."
Jennifer's voice came thin from the rear. "Enemy still holding south. No push. Signal degrading. They're not moving."
They couldn't go back. Couldn't stay. The building was failing, the cold was accelerating, and the stranger was either a threat or an asset they couldn't afford to ignore.
The man uncrossed his arms. Took a step toward the northern corridor.
"There's a passage through the service corridor. Connects to the north loading dock. Covered, no direct wind exposure, intact structure." He paused. "It's not warm. But it's not dying."
He kept walking. Not waiting for agreement. Not offering to lead. Just stating the information and moving.
Uncle looked at Jae-min.
They didn't trust him. There was no reason to. But the junction was filling with cold, the Archbishop was waiting at the south gap, and Ji-yoo needed treatment that didn't exist in a frozen building cracking apart around them.
Uncle released his sidearm and moved toward the northern corridor.
"Follow. Stay tight."
The group moved.
They weren't alone in the cold.
That didn't make it better.