Prompto.

[ Noctis takes a deep breath, looking back at him. He can't even begin to imagine the depth of Prompto's hate and distress -- he feels largely the same, but this impacts his best friend in different ways. ]

I don't want him to hurt you. Or have an excuse to hurt you. We have to find a way to take him down so that he doesn't pose a threat to other people here. The ones we care about. [ As much as it pains him to admit it. ] I think... Ignis might have an idea of how to deal with it.