During this early transition offense, the defender backpedals and allows the offensive player to spin and seal him. The defender then uses his right arm chest to lean on and displace the legally positioned offensive player. The lead official picks up the competitive matchup. While this could be a foul, both players appear surprised by the whistle. This might be a time to allow the play to continue and discern whether the play demands a whistle or if the situation will dissolve and we can play on.