what if the two black holes created by Jack English and Alt Calliope collided, what might happen?

An even bigger black hole, presumably. I don’t know enough about physics and honestly, I don’t think Hussie does either.

Unrelated but, as much as I love [S] Act 7 and, The Rapture as a title, I’m still mad it wasn’t [S] Collapse. You know. Cascade, Collide, Collapse.