[Unarmed]

Ugh. I think I would fold, but I'd hate doing it.
Shorty has to know he's playing for his entire stack here so his range is pretty limited IMO. Any pair he has that you have beat has to raise that flop to shut out big stack's overcards.

I can't see him having anything but AA/KK/AK. He's not dumping AA/KK after his master plan of limping PF "worked". If he has AK I think he folds the flop a good % of the time given your read, and I don't think AK calls off 1/3 of his stack PF anyway.

Given all that and the fact that big stack may actually have a hand (this flop is bone dry so there's nothing terribly wrong with the severe underbet) I would fold.

Yuck. I even hated typing that...