I disagree with all the insta calls.
This is a weird card, and instacalling here takes away the process of trying ot figure out what he can make this play with.
yes, AA and KQ just got here. I'm far more worried of KQ than AA though. HOWEVER: if he turned his straight or a set here, why would he push? you're showing weakness - why push a hand that you want to get called by a guy who suddenly looks scared.
I think you're more likely to see something like TJ, AJ, QJ, KJ, AT, etc here than the nuts/second nuts. THen there's all the spades combinations, including a few big ones with the
(where he's likely to think he's ahead here). And you can't rule out the bluffs of course.
Bottom line. there are two hands that scare you, and literally dozens of hands he can call you on the flop with and push here on the turn with. If he turned (or rivered) you, chalk it up as variance and keep playing.