On the river, they’re beaten and bet the rest of their stack into the nuts, which calls, and they lose a stack. KJ was nearly all-in to bet pot on the Turn, and probably should have just put it all in to put maximum fold equity in front of him. Turn gives him top two pair, erases the flush draw, and they put in a second pot-size bet, which ATs calls with their gutshot draw, which they then filled on the river. The loser had checked top pair from early position, having hit top pair on the flop with their KJo, 3-clubs to the backdoor flush, and when ATs bet into the pot, they raised, and got called.
This was literally the previous hand played to the one we’re looking at here, and when I observed how the betting was going on this pot, I decided to sit out the next hand in order to watch how it went down, to see if these players were playing wild, or if they were playing sound strategy. History: I had just watched the two players seated behind me go all-in, in a hand where KJ had top two pair on the Turn, and unfortunately for the aggressor, they lost on the river as his opponent filled the backdoor gutshot Broadway straight they were drawing to.