Fold pre-flop. Much as I don't want shorty to get the blinds for free, I don't want to assist his tripling up, and I sure don't want to give up my chips to a push from behind (and the BB ought to be trying that a lot, I would think). I'm willing to take my chances between BB winning this one and having to attack seat 4's blinds when shorty wins this hand.

Given the predicament you've gotten yourself into, I think you probably have to call. There's a chance you've got BB out-kicked, and top pair here should beat shorty most of the time.