Thump. Isaac cursed silently under his breath. He kept forgetting how narrow these ventilation shafts were.
Shimmying through the ceiling of the medical center, he'd caught glimpses of a few quiet rooms, all empty and dark. From what Isaac could tell, the hospital seemed pretty dead at this hour - as heavy and still as the blackness that still reigned outside, awaiting dawn to creep its way into the sky. Any noise he made was sure to be heard, if there was anyone there to hear it. He would need to be more careful to keep quiet.
1, 2, 3, 4… He lay low on his belly, counting the beats from the rhythmic throbbing in his chest, his ears straining for any signs of life outside the crowded chute. All that stirred was the whish of a fan at the far end of the shaft.