[Mike Simonds]

Good Judgement will be our best friend on this one.

I can see calling holding if the defender holds the primary receiver at the line of scrimmage and makes the QB go to his secondary receiver on the other side of the field. This is going to be tough to call because you will be looking at the receiver and defender, and at the same time you need to be aware of what of the QB is doing.

I've seen defenders take a free-shot at an unprotected pass receiver after the pass is clearly not catchable. So that contact should be called also if it is judged unnecessarily rough and the defender was not playing the pass.