Agree Frenzy, they have to make things more black and white and rule with consistency. Greenburg is out of his depth and the game is losing it's way.
Based on the way things are today, Napa shouldn't have even been penalised. I reckon they should change the rule to make the defender have a greater duty of care such that they are not to hit the attacking players head. But the way it is now, unless that was deemed intentional (in which case it should have been a send off) then it should have been play on.