This isn't canon in the slightest, just a headcanon I developed, where the Bad Batter went all Joker on us
Backstabbing your partner before he could "end the world", eh?
And in betrayal, you have left this place to rot before it could be truly released of it's suffering.
Who is the real culprit here, puppeteer? Prancing about with his new yet shattered puppet, the Judge?