Scenario. 1/2 Bally's Las Vegas. I normally don't play 1/2 as much but I was here playing a marathon session, I started at 1 AM and it is now 10 AM the next day. I was in the game for $900. I stacked off my first buy in with 88 on a 567 board vs two pair on a Q turn. Then got top set stacked off to a straight. So at this point my stack was around $650 when this hand comes up. The game dynamics obviously change significantly for this duration but generally the game is pretty tight so my VPIP is probably around 60 and I open raise pretty much everything in position with suited cards and broadway cards and pp. V has about $600 as well. I think hes a local reg, maybe mid 60's. He over values top pair. He barrelled twice with A8 on a A94K board, then check called an all in on a river 3. Barrelled meaning large over bets. So I would imagine top pair is the nuts but I also can see him calling with over cards on a low flop. On to the hand. I raise $10 my fixed opening raise size with no limpers HJ with QT off. V is in the BB and calls. Heads up Pot $21 Flop J54. BB leads $20. I call thinking I can catch some equity with 9, K, Q, A. Plus he seems to over bet pots so I decide to float in position . $61 Turn Q BB checks, I lead out $35 and he calls. $131 River T He checks and i lead out $55 where in insta jams all in. Pot $186 My first thought is check raise river at 1/2? How often is this a bluff. But I maybe just maybe see I guess he could have AK. I never see 98. So at best he has JT, worst he has QJ. Are you calling it off or folding.