1810 England, the height of the Napoleonic wars. It was thought that humans walked the path of enlightenment leaving monsters and dark things behind. However, those monsters and night stalkers merely hide in the darkness, as a young maid, Bernadette, soon finds out.
Depends on what his motives are. If he was brought up to fear werewolves and vampires he'd most likely shoot them without knowing what they truely are. If he knows those "monsters" are good-hearted and shoots them anyways, he's most likely the sort of guy who is doing such for his own gain. Greed and whatnot.
But I don't want to jump to conclusions yet...he does seem suspicious though.