Yeah Bones needs to chill the the open palm. He does it purposely because Jackson teaches his fighters to to that. Once your opponent gets poked; one it will be deemed accidental so you can get away with it a couple time. Second the dude will see hesitant to jump in because he will be scared to get poked again.
Greg Jackson is know to this "legal but dirty" crap. The baby oil trick, foot stomps, wrench the arms to pop the shoulder, how to target the head with an elbow to break and orbital, how to effectively cut your opponent to get a stoppage.
Big Jon is the only ref that warns fighters not to do it.
Big John is the ******* man . Awesome ref, easily my favorite. He blew out his knee in the Werdum vs Browne bout, hope he heals up quick the MMA world needs him!