1/3 NL.
V is a 20ish reg; though I don't have much history with him, I remember him as being competent. He has recently transferred to the table with ~$750, and his stack has dwindled to ~$400 after running a bluff with a combo draw in one hand, then calling a turn shove with an overpair, losing to two-pair (AA<J3). Both hands against fishy players; I would expect him to play these hands differently if he'd had time to observe their tendencies. Effective stacks are $300 (villain covers me). I don't think he is neccesarily tilting and only expect his recent history to impact on the following hand marginally.
Villain (UTG+1) raises to $15. Folds to hero in the SB. We call with K
Q
Flop [$33] K
J
5
Hero checks, Villain bets $25. Hero calls.
Turn [$88] Q
Hero checks. Villain bets $50. Hero??
I expect two-pair is good here most of the time, and a standard line would be to check-raise for value and to protect equity on this board texture.