Mostly responding to theBoys comment.

I think what some of the guys were saying is that when the shot goes up you should be able to tell and when you see the push after the shot has gone up hold your whistle and don't call the foul unless it puts B at a disadvantage for the rebound if the shot is missed. If the shot goes in there really isn't any advantage/disadvantage so let the push go.

Now the case is if the push displaces B2 enough that it is more violent contact then you should call it no matter what.

I have been reading the posts on this board for about a year and there have been many threads regarding this situation and I would have to say that what I wrote above is what I have taken from those threads.