[just another ref]

Originally Posted by DLH17

Those points may be valid, however, if in the end, the offensive player's ability to beat the defender and complete a play is not compromised, then why call a foul?

You call it when the defender makes a practice of it. Both players standing still, or moving slowly, not attacking. If you haven't called it at this point, and A1 makes his move and beats the defender, by all means let it go, whether the contact continues or not.