[just another ref]

Originally Posted by JRutledge

I agree if you are only waiting on the shot to be complete, but the reality is you sometimes do not know if there is really an affect of the contact until you see what happens with that shot. The best example is a jump shot there very little contact and affect the trajectory of a shot, you might not know until you see how short the shot falls or not. I know many that wait to see if the ball was lost, a violation was committed before we call a foul in favor of a ball handler, so why would we exclude what happens on a shot?

Peace

There is no way to ever truly know the effect of the contact on the shot.
Contact on the arm of the shooter may actually cause a shot to go in that would have otherwise missed. You just have to use your best judgment at the time and go with it. Some things are obvious. A player dunking can usually absorb more contact without disadvantage than one shooting a 3.