what are you talking about? a double snapout?
then its what gbursine said
but i use lk (lp version) rocket punch, it resets so u can do it less times. if u snapped the opponent out and the assist is still there, try fly lk, hk, rocket punch, then do the lk rocket punch juggle reset.
its hard but possible, if u double snap the opponent, dash up c.lkxxfly rocket punch juggle.
with juggernaut if the assist is just there, launch, air combo ends with hk, f+hp on ground repeat. headcrush near death if u want.
i smell the negs already so just go ahead and give me some m1x.