Null and Void

i'm having an issue with this screenpack, all of my characters work fine so far except for Onslaught (y'know, the Marvel vs Capcom final boss) for some reason, once he reaches phase 2 and passes a certain amount of health, he refuses to take any sort of damage whatsoever, if it helps, it only occurs in phase 2, and it ONLY occurs on this screenpack (i tested it in another and he can die just fine), it also only happens in phase 2, specifically, phase 1 works completely fine. i've also tried redownloading the character entirely, but that still didn't work, i don't know why the character refuses to die in phase 2 on THIS screenpack specifically, any help would be appreciated