Pretty dry flop, they are repping 55/77/JJ pretty much and then bluffs.

I like your call line, river I fold and give them respect. Really never expecting to see a reg 3 barrel here with air or a whiffed draw. More often than not it's a strong value hand. Fold and then watch them closely the new few showdowns to see what they are showing up with when showing aggression.

Hmm if he's reggish that seems a dry flop to be raising. Surely he would be X/C his sets there a lot, which then doesn't seem to leave him much room to build a decent x/r range. Half pot turn and bomb river is odd line as well. I think without reads I'd be doing the same as you and giving credit on the river.

For no real reason I felt like his hand might be like 98s or something that was raising a GS, and BDFD, feeling frisky on a dry board. Would be a terrible line but it was my first instinct.