“Boring sums. Boring history. Boring geography. Boring, boring, boring Seven Strictures. Why can’t we study sword fighting? And sailing? And monsters?”
―Emily, complaining about school
If anyone didn’t catch this it’s confirmation that Haise doesn’t seem to have all Kaneki’s memories back. His eyes were stinging and his eyesight was darkening around the edges because he was have a flashback to the sewers with Hide.