He moves away from the door and grabs some pants pulling them on before going back to the door. Whats the point in a shirt when he's just going to end up without it if he changes again? Which is the plan, given Lan Wangji has already told him he would carry him. He opens the door to let the other man in.

"Key and empathy. I think..it's around here somewhere." Wherever they are, they are likely together. But that isn't the only thing he needs inside the room that he needs to grab.