There were 2 fights after clean hits. Both times the refs didn't call instigator. Gave the players a break. Next fight, again after a clean hit, clearly Carlo was the instigator. So, they had given each team one chance. Had to be called. Next one, same thing. Sbisa the instigator. I thought they called it just right.
I am just not a fan of that call at all under those circumstances. Unless one guy has his gloves stapled on and is clearly turtling or trying to get away and he gets suckered or gets jumped on, leave it alone. That rule sucks the way it gets applied.