[Cassie actually laughs when he says that-- that she's not a monster? Ha ha ha. It's small and restrained thing, like an in-joke that only she finds funny. There's an edge of bitterness to it too, well-hidden but there.]

You know... you said the exact same thing to me last time, too. But I didn't believe you then, and I don't believe you now.

You haven't seen what I can do. What I have done. I thought I could control it, but I can't. All I have to do is get angry with someone and then suddenly! I'm force-choking them like I'm Darth Vader or something. --Sorry, pop culture reference. Anyway, the point is, dark magic can't be controlled. It controls you.