Asriel isn't feeling any kind of a tingling, though. Rather he's feeling deadened nerves. He's been staring at books and shelves for hours. Tyzias' groan of exasperation is contagious, and he lets out one of his own, bumping his head against the wall repeatedly to keep himself awake.

Bonk. Bonk.

His horns leave small impressions in the shelves.