If the Center doesn't see this, then someone had better! First crack would obviously be the AR in that corner, but if he is screened by the two players contesting for the ball (or intently focused on the ball as he clearly was), then the 4th official should have a decent line of sight on this. The last resort is the other AR.
This is an action that will enrage the offended player and his team. Failing to get this is inexcusable, especially given the use of the headsets for communication!
Here is video of the incident (from 9:18 to 9:45):
http://vids.myspace.com/index.cfm?fu...deoID=51610359