Aw jeez, they can’t kill J’onn, he’s the Jolly Green Buddha!
Really, I know it’s unrealistic for superheroes to basically be immortal, but...
1. Comics aren’t supposed to be realistic, it’s people flying around in spandex shooting beams out of their eyes for pity’s sake.
2. Once you’ve killed Superman it’s pretty much been done, you know? Ditto if Captain America and Tony Stark take the dirt nap.
Yup. J'onn snuffs it -- whatever that really means, ultimately, at DC and Marvel nowadays ;) -- and Barry Allen makes his triumphant, back-from-the-dead-and-Crisis-One-for-good return. (Although credible sources at DC have let it slip that it may be as a villain, iniitally...)
You think Baby Huey could take the Hulk, though? I mean, supposing they were both locked in the X-Men's Danger Room, and all... ;)