I think you're making too much of this. An "arm in the back" sounds like a foul to me. Get it when you see it, and don't worry that 3 steps later he starts his shooting motion.
If you wait, you're saying the arm in the back was incidental. In that case, call the shooting foul and ignore the incidental contact. Contact is not additive.
If you make the right call, the game situation is irrelevant IMO.
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Cheers,
mb
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