There's one thing Wilhelm might hear that's evidence that yes, someone is inside, is the sound of footsteps. Kell has been pacing the room like a caged animal since the moment he came back. He almost jumps at the sound of knocking. Answers before he realizes that, well, they're not expecting a visit. Nobody can help him anyway.

"Oh, it's you." Disappointed? How can he be disappointed if he can't even tell who he was expecting. Not Wilhelm anyway. "What do you want?"