[He nods--just a little, because he's enjoying letting the firecat play with his beard]

I don't regret killing any of the people I have. There's always been a reason--my life, or someone I'm protecting. Something that had to be done.

I don't believe in it as a first response, but I don't think you should regret killing if it means saving yourself, saving people you care about. People who depend on you.