Since you're the PLO pro let me ask you if this is a slowroll.
Flop comes Q
4
5
and a blind pots, EP calls, MP re-pots, I call all in and everyone folds back to MP. I flip over Q
6
for a diamond sweat. Turn is T
river is 3
and he turns over 44xx for a flopped set. I immediately turn over another Q6 for a bigger flopped set. He basically goes balistic for 10 minutes about that being the worst slowroll he's ever encountered (and I know he plays for a living - more NLHE than PLO though) etc.... If at any point before showdown he would have opened his hand or said he flopped a set I would have showed my top set.
I see people do that ALL the time and nobody ever says anything.