It's quite possible to have OPI away from the ball but that is a judgment call. My question would be, "Where is the ball and when was the foul?" If the ball goes to the other side of the field but the foul by A (pushing off, e.g.) occurs before the ball is thrown to either side, then there is a good case for throwing the flag.
As Waltjp said, keep in mind that restrictions for A begin at the snap.
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