BTN vs BB AKo vs ??

Without any info on the villain in this hand I would most likely fold the river as well. Decent change villain has a flush. It seems unlikely villain would lead with trips on the flop but on NL2 you never know.

Cheers,
SDK1987

I think you are giving to opponent so wide 3B calling range. Did you call 3B with K4s .. or something like this?
I see that flop is more on side calling range BB. He could have 88, A8s, AcTc ....

this a really weird line by villain, but we're just going to have to call down (could also raise turn btw)

we're calling down because villain should not lead on the flop, thus making it hard to define his range and we have a really good hand and need to be good only 1/(1+1+1.59) = 27%

when we can't define villains range accurately, i would try to call down the strongest hands in my own range - AK is in there

as far as population tendencies go - recreationals generally don't give up on bluffs, so if he was bluffing on the turn - he'll continue a high % of the time here on this river (scare) card

or simply put - we will not be folding many top pairs top kickers in a 3 bet pot

I guess fold is OK
Villain has mostly no air in his range when barreling flop turn and river

He can have hands like
22
99-QQ
8x

Most likely 22 or 8x