I understand your reason Brad for not calling a false multiple (in my example), which is b/c it is not commonly called. My thinking was that if a player gets fouled and then tries to complete the play than that player should have the same rights to finishing his shot as he did prior to the first foul.
The best way to avoid my situation is to let the play develop and then call the foul. When I blew my whistle on the first foul, I was committed to making that call. After my first whistle another foul happened that directly effected the shooter's attempt at scoring a goal. I felt that I should have called that second foul for that reason. I usually let the play develop but B1 smacked A1's arm pretty hard so that's why I called it right away.
I guess this all comes down to the individual referee's preference or how their assigner/association wants them to call it.
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By the way just because a multiple doesn't happen all the time for you shouldn't mean that my girl can't enjoy it when it does. I guess for Brad's significant other it would be a false multiple.