Peri had finally managed to get the hell out of the lobby without the overwhelmingly freaky creepy feeling of doom following her and had headed upstairs to the apartment. Yaaaay, stairs!
And then the stairs started doing weird things to her. Sending her to floors she didn't want to go to, couldn't reach from that stairwell. She wasn't sure how long she got caught up in it, but eventually she had enough.
Finally, she just pulled over to the side of a hallway, sat down, and cried.
Not noticing that Lara was only a few feet away, of course.