600/1200 river

[Micturition Man]

It should be a bet. He should not be check-calling a better hand, although Neverwin can be quite a bit too passive.

He could be c-rzing but I think it's worth the risk.

Also I think given some of the craziness you described and the fact that you were a button raiser, his turn 3-bet doesn't have to mean set or straight. Could be some bdoor flush draw + pair but I don't see him c-rzing the river then.