So tell me about how a zetsu awakened mangekyo sharingan....well, i think it was the doing of zetsu who transform into kakashi to kill rin
So tell me about how a zetsu awakened mangekyo sharingan....
Reasons unclear until now,it would be revealed in future chapters.
But I think that we can safely assume that Kakashi was aware of what he did because he was crying and he seemed to be in pain with his actions.
No-one knows and I don't think Kishi is gonna tell us anytime soon