He's made sure most of the roommates are outside, but there's one inside that can hear him scuffling around upstairs and his slow trek to the outside. She couldn't blame him for wanting to get out, she understood that inside = completely not fun when you were used to being on your own.

That didn't mean she was going to let the injured member of her household escape without a hidden escort. She slipped out of her window, following him by scent more than sight to keep herself from being seen. She didn't want him to feel like he was being watched, but even though she hadn't actually ever conversed with the guy, he lived in the house she was staying in. He was part of her clan even if neither of them was consciously aware of it.

So she slipped out after him and kept an ear out for any sounds of distress.