I feel like V1 has the A
7
here. Let's assume he is a good player until he shows you otherwise. Why would he just call on the turn with the straight, having two flush draws looming, or a set for the same reason? Hero should feel like he has the best hand on the turn to an insta-flat call. That tells us the button wants you to slow down on the river, but was never folding since he picks up more outs on the turn if he has that A-7 or even the A-8 of spades.
If V2 thinks he is good on the turn, he can only feel he is beat if he puts you on the Ax of clubs and he has the pair-open-ender combo. But does he call a pot-sized bet on the turn with those hands? More evidence of a medium suited Ace of spades. I just don't think if he is solid enough that he blanks a club draw on the turn and continues chasing on the turn to a near pot bet.
I'm in the minority perhaps, but I do say continue betting, because I find it hard for him to feel he can steal this pot from you with how strong you played the hand pre, just called post, and woke up again on the turn. Perhaps he read your slight overbet as weakness on the turn, but if he feels you were bluffing with a club draw and binked an ace, would he bet any one pair hands that still have showdown value? I find it hard to believe he ever bets 8's, so I think the pot you have is the maximum you are getting unless he oddly does have that set.
If it isthe A-7 of spades, does he fold to a shove? Only if he feels you aren't capable of making a play and a shove from you means a set or better every time. Then again, who says you have to shove? Even a smaller bet can be $100 or match the $140 from the turn. But I think any bet should be your stack because it looks more like you are just jumping off a bridge, but that wouldn't make sense either since you appear to be ahead in the game.
I guess what it boils down to is the whole hand played quite out of line. You turning a set makes sense, but it almost feels like he can't have much of a range unless he got really sneaky with Aces pre. But wouldn't he want to make it look like a squeeze play and raise the button? Perhaps he feels that isn't really a good $1/$2 play since a 3-bet often takes pots down in $1/$2.
I'm really curious to see what he had and the result now.