It really really depends on what you're read of an "unknown" on Party at these limits. Yesterday, at 1/2, I had AK and had an unknown call 4 bets cold preflop and cap a king high flop with k9o. You can go "what hands is this guy possibly capping with" and fold TPGK here, which maybe we could if we had any reads/stats on the guy, but I think that is not a good idea in these games, as you are easily good 1/5 time here.