Firestorm died? We didn't see a body did we? So using comic book/TV logic ...
Somehow Henry getting out of prison freaked me out more. I am not that knowledgable on Barry Allen's comics biography, but did his father ever get out of prison?
Probably got sucked into the black hole when it was stabilized by barry. He got sucked in, they split, and the hole blew up. And Jay and Zoom and Atom smasher came through when the black hole shut. This is my theory. Not sure.
EarthSentinelAB's comments