Villain seemed to be a reg (he was sitting on some tables on his own), but I'd never seen him before at the PLO tables. It's possible he was an NL reg and just tried his hand at PLO.

He was probably on the weaker side and too loose pre (defended about 75% in the BB [65% call, 10% 3b]), and also a bit more on the cally side postflop, though he was capable of making some unexpected and unorthodox plays postflop. I hadn't seen him make a huge bluff though.

One hand that sprang to mind was from about 10-15 minutes earlier when he flatted QJT6ss in the BB, the 642r flop went check/check, he check potted the Qc turn (it brought a BDFD) and then snapbet 3/4 on the Ao river.

I'd probably bet here as a standard, but I don't think checking behind is bad. Anyone disagree?

Here's the interesting part (#1): What do we do vs. the 3b? I kind of thought about the possibility of a 3b when I raised, even though I think it's quite rare (I'd expect him to call much more often), and I had already kind of made up my mind that I would call to keep his bluffs in.

He could definitely have 64xx in his range, but I wouldn't discount 33 and 44 either, but I wouldn't think that he'd play a lone 6 this way.

Interesting Question (#2): I thought this river should slow him down sometimes because A6xx is definitely a decent part of my range after my turnplay, but he bets very quickly (probably within 3s, reminiscent of the hand mentioned above). What's our play?