As Lucifer's worry rolls off of him in waves, surprise touches Wilhelm's expression. Despite everything, he's still amazed when anybody cares enough to check on him. That has less to do with Lucifer, and more to do with himself.

"I'm not out by myself. You're here now."

Matter of fact, with only a pinch of sass. Pushing a hand through his hair, he stumbles into a placating tone to explain, "Elrond was taking too long looking at books. I was just going to walk around the block, I wasn't going to wander too far. Promise."