So I've been dabbling a bit poker-wise the past few weeks, just a tiny bit.

Coolest hand(s) I've played in awhile came up earlier.

I'm playing a regular on FTP (cause he has the shiny bronze triangle) who is trying to start 6max PLO tables with me hu on 2 tables at once. He started one table 110 BBs deep and the other 50, but has chipped up on the other one to 140 BB or so. It's 3/6 PLO w/antes and I cover on both. So far he has played pretty well if straightforwardly with no hugely interesting hands coming up, it has been maybe 40 hands total. He has been 3betting more than usual, though this likely to be partially because of the initial shorter stacks.

On one table he 3bets I call w/ 88Jxss or something. Flop comes 995r he checks quickly, I check (he has not checked in a 3bet pot thus far, but all the spots have been like 1-2 PSB behind previously on boards where checking didn't make a lot of sense so I don't really know too much about what this chekc means). Turn comes down a 9, he thinks briefly and bets 78 into 128 or something. I call.

At this point simultaneously on the second table he 3bets and I call with Q2hh63dd. Flop comes 776r.

On the first table the river comes down some blankish card and he bets 210 or so after thinking briefly.

On the second table he bets 72 into 128 or so pretty quickly.

Normally on the first table I would fold, but this time I decided to call.

Why ?