[He looks so affronted for a kid who basically floated over for the sole purpose of determining whether or not he should do just that] I haven't killed anybody! If the person is still alive, you can purify them just fine.

And I wouldn't do it anyway unless you wanted me to. [Or unless she went on a rampage but he feels like telling a person who looks to be on the verge of a rampage "I'll forcibly purify you if you go on a rampage" will not discourage said rampage]