well i did figure that if robin was around, he wouldnt be the same..there was an indicator for this at some point--forget what it was.
i mean. you gotta be some next level freak to think what hes doing makes any sense.
poor haruki is gonna be traumatized after this...i feel like this is the type of thing to make him even more resistant to people interested in him (his sister)..which means, as for our supporting character...well...
oh two other things after reading through a few of the comments: i did also consider that maybe this isnt really robin; perhaps he got a surgery of his own. also--i dont understand why he felt like torturing haruki either..typically a situation like this would have haruki ignored completely, but robin wanted him involved..?
guess its just part of whatever changed him.