He does do his best to see if he can understand any of that chatter despite knowing there's no way in hell he will. Where's Google translator when you need it?

Looking at their little explanation (good penmanship there, Librarian!), he furrows his brows. It doesn't quite clear things up, but he hopes he can put two and two together. Narrowing his eyes, he lifts his finger and points very close to the little drawing. "Did he miss picking up a book?"