He did suddenly have this turn... but what happened before it? some big emotional trauma... seeing Satoko in this states... what also happened before it? him being treated by the coach after cool detective Rword him... did the coach which is also a doctor make him take a liquid? Inject him with the syringe?... the one that we know it got to do something with them turning evil... this honestly make sense @_@ he could have done that to Rena and Mion too with ease, he can reach them and they trust him and i think they both go through a fair share of emotional thangs... Mion with her family... and Rena with what happened to her when she was in her old school... which btw could also be the doing of him @_@, they called him the director... could he be the one directing the evil inside of them? but it feels kinda like they are following him too... like it don't just turn them evil but allow him to control them... but for MC? he is still controlling himself... could Satoshi also went through this? and could the reason the coach killed him is because he couldn't control him? is he going for the MC too for that reason? and this time... he will also probably use someone else @_@ i don't think if what am saying is true, they would show him this early on @_@