You both had to hide from the people who were after you. The head of the group sent a couple of goons to try and get you off their tail.
The goons found you and Reacher, but you both noticed them a block away. You both started to run, and they chased right after you. You cut through an alleyway with him and into a building that looked run down, abandoned. It was dark, but the windows let some light into the place.
You both ran in a hurry and ended up going to hide -at least for now. You ran into what seemed like a room that could be blocked off once you got in. Reacher followed as he glanced back at the guys as they got further away but were still in pursuit. Once inside, you realized that it was not what it seemed. It was a small -closet spaced room, like an old cleaner's room; it smelled of old chemicals. Reacher bustled in after you as he closed the door behind him, almost - practically falling on top of you as you were standing at the door because of the small space