He finally had an epiphany and went over to the dark side lmao. In other words you could say his mind broke? Though to me it seems more like he's gotten a bit more conniving and cunning. You can tell from his expressions that he's got a plan..a very dangerous one but still xD
OKAI UM WHAT HAPPEND IN PAGE HE LOOKS LIKE A WHOLE DIFFERENT PERSON UM LIKE DAMN ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
http://www.mangago.zone/read-manga/prison_lab/nbt/d9db78b345b41884/Vol2_Ch1/9/