It seems that unless there is an unusual circumstance, the Makai Knights don't usually kill humans.Catastrophe wrote:The Fish Tank episode had Zaruba saying something along the lines of 'It isn't your (Maki Knights) job to deal with human crimes'. Technically, if they were killing people to feed to the Horror, he can't do anything about it.
Aside from first season's Kaoru who was stained by the blood of a Horror.
In "Fish Tank" and "Magic Bullet" it seems that it isn't their job to punish humans. They protect humans, (all humans considering from "Fish Tank"), and even those who want to kill them. (Kouga didn't kill the man trying to kill him.)