Breaching the Perimeter

The portal swung inward as a delivery courier knocked. I did not hesitate. Before the heavy timber fully cleared the frame, I slipped through the lower clearance in a single sprint. The carpet of the outer corridor is dense and tightly woven, providing immediate grip. I accelerated past three identical closed doors, pivoting sharply around a metal trash chute corner. At the end of the hall, a wide radiator sits beneath a high window overlooking the stairwell. I scaled the metallic vertical grates and secured the flat top. The indoor sector is behind me. The true perimeter begins now.