Aces flops a set: Now fold???

[HoldEmKillah]

A friend of mine just told me about this hand from a $20+2 SnG on Party from yesterday. Friend is the one holding the aces. *By all accounts, I have every reason to believe the facts are exactly as they happened w/o actually seeing the HH (spelling that out before the doubters start flaming)*

Very early on, Level 1, effective stacks are 800.

Dealt to HERO (button): A [img]/images/graemlins/diamond.gif[/img]A [img]/images/graemlins/heart.gif[/img]

UTG raises to T125, MP calls, MP+1 calls, HERO calls. BB calls.

FLOP: A [img]/images/graemlins/club.gif[/img]K [img]/images/graemlins/diamond.gif[/img]Q [img]/images/graemlins/club.gif[/img]

UTG goes all, MP goes all in, MP1 goes all in.

HERO???