Jack waved him off. “She’ll try. So many have, and they’ve all failed so far. But it’s good that it’s a little dangerous, a little risky. It’s no fun if I know how it’s going to play out. Some unpredictability, it gives spice to life. Maybe I’ll kill her right after I see the look on her face. Maybe I’ll escape and leave her to wallow in her misery.”
This is reminding me of a character from El Goonish Shive:

Though Jack’s enjoyment of the unpredictable seems a bit more subdued.
Escape? From a fifteen story apartment building, against a supervillain who can fly and level city blocks?
Good point. What does he do, use a knife like a vaulting pole? Then again, the way his power was described, I’m not sure that would work.
Then again, Jack had done worse things than murder the child of a cape like Purity, and he was still here.
True.