[The whole display gets the big guy to let out a horrid, bark-like laugh, and he shifts his stance - hand on one hip, bouncing that hatchet on his shoulder and everything.]

Aww, 'ti maringouin think himself a hero, huh? For killin' criminals?
Well...
'Least that makes two of us.

[And now he's finally going to bring down that hatchet all the force his arm can muster...
Onto that criminal Katsuki had left unconscious on the pavement, splitting through him with a disgusting, wet crack.
Give him a moment. He's going to take the time to get the guy's bracelet while he's at it.

... And then he'll turn back to Katsuki, though he isn't releasing the poor boy just yet.]

Gimme one good reason I shouldn't kill you, too. We ain't need more vampires 'round here - turned or not.