It naturally falls over - it is only a stack of books, after all. If it was meant to provoke him, Kitty will find herself disappointed, because he doesn't respond in the slightest. Even the general undercurrent of awkwardness doesn't really shift. The book he cares about is the one about understanding people, which is currently sitting in his lap and has his thumb acting as a bookmark.

"He says that the symbols can be important for magic."