Re: 5/10, wtf river open push
Fold.
I think he'd play a set differently all streets unless he has JJ and is overplaying a rivered set of jacks despite the 3-spades.
He either has a higher stright, a flush, or a bluff. Given you're raise, c-bet, and turn bet, he'd be expecting you to have a good hand that might be tempted to call a river push. So, if he thinks you might strong enought to call call a river push, it makes it less likely that he has air.
So, fold is probably best unless he makes this kind of thing a habit on river scare cards. If he seems to be a habitual bluffer, then eventually you'll want to look him up in a spot like this, but not here.
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