Yah... Rena don't care about the morals of killing @_@ the 2nd kill is something that will not go away like the 1st one... right now she just lost it... so i guess this chapter got nothing to do with chapter 3 @_@ and also... for the other characters, i always said they went crazy because of the director's injection... but her? she didn't take any... but when she was in her previous school... she went through a lot that could do the same... so maybe that person put something inside of her that would activate when she reaches this point in her life... we know that he is doing the long run... something like what Rika is doing @_@