[Well he can get from context clues now the answer to his question "why did you kill Caleb."]

... Yeah. There's... where I'm from, there's this thing called the yakou. It influences ayakashi to become more violent, to attack people, so that humans learn to fear and hate the ayakashi. It happened to my friend once. It happened to me, too. But... here there's nothing to blame for it. This "story" doesn't even have a body. How are we supposed to fight it?