Responses
It's a metaphor sort of thing, he didn't actually kill her but the her that killed other people and lived as an assassin. Since that was the her then, and all that made up her, by slicing off her right hand, he killed that version of her that I just described, therefore killing her dead and unlocking a new her. So that her is dead and the her that lives to live and be with him is alive, a whole new version of her if that makes sense
What was the point in saying kill me dead. You can't kill someone alive. I mean technically you can only kill someone alive but not in the sense that she used