My guess is that asshole is still somehow going to get the upper hand and we're going to get an arc where he's his dog. Maybe simply turning the bomb back on with the remote he still has.
You know, for all I was hating on this villain coming back again and again, I think this is a fitting climax for the fight against him. Just the MC and the kid defying him to his face, just like the whole story has been.
I've seen people talking about a season 2 where the guy is still around though, and that concerns me.