The OR is a 19/17/7 taggy reg (CO open is 38% over 500 hand sample), and the BB is 25/19/4 who might be a reg but I'm not sure. My stats should look quite standard reggy to these guys (23/20/8).

Pre is kinda close- my default being 3bet- but small blind was a fish, BB hadn't shown to be crazy squeezy, and the OR had a 38% 4b so I called.

I think taking a shot at this flop is mandatory with the gutter/overs/bdfd, and then the BB check raises which is curious. I feel like this flop hits my range harder than his, as I figured his big blind peeling range is decently wide (albeit probably not J5s wide but suited 3 gaps prob).

His check raise could be a few things with top two and most sets being in there (99 maybe squeezes pre considering OR opens something like 38% from the CO-but that supposes villain has these stats too), but this seems like a decent spot for him to bluff considering I'm probably betting a bunch of hands and the OR is cf this flop often. I thought he could have some semi-bluff midpairs, straight draws or just whiffed overs (unlikely but possible). I called with the intention to turn something-spades are good, turning top pair or the nuts would work. It's possible he has decent top pairs K9s, J9s, Q9s, A9, T9 also.