Kell wasn't really listening. He can't focus all that much on what anyone is saying unless they say it really loud. Something in Wilhelm's words draws his attention anyway.
Suddenly, he straightens up and turns around to look at Wilhelm as if it's the first time he realized there's another person in the room.

"You're right. They must have. What do they really know about us!" There's fire in his words, in stark contrast to the dead resignation from just a moment ago. A bit too intense, too feverish. "There were books they had us look through before..."

As soon as the fire has started, it's gone again.

"Nobody is going to let us into the library at this hour."