They hunt people with magic? Are all magic users witches and warlocks, or is that a term for a particular set of skills?

[It would be nice if he was surprised by any of this, but he's just not. Even if Ambrose had used his magic in irresponsible ways (for being called a witch or warlock hardly seems like a positive thing), he should have been captured, retained, questioned. Not just killed outright by a mob of gangsters claiming themselves to be some kind of authority. Maybe he's misreading the situation entirely, projecting his own experiences on it, and he doesn't know enough context anyway, but none of it feels right.]