Nobody. I'm not walking through the landscape to kill people. But in order to survive or to protect the ones you care for, you sometimes have to kill those who threaten them! Didn't you see what this guy was trying?
*stops* Yes, I saw it. And I saw you survived easily! Where is this knifewound of yours? Gone! A human like me dies from such wounds! How can you compare that?
*grabs the girl's hand* That's not the point. He thought he was able to kill me with that. And he tried to kill me with that! Murderers who don't succeed in reaching their goals might find more ways to try it! Trust me, I experienced this more than once!
No, the point is, you killed him. And you wouldn't have revived him if you didn't want to convince me of something. You can kill so easily - what tells me you wouldn't do this with me?