Offensive "right to the ball"?

[Thom]

Had a situation where we were pressing full court. A1 tried to pass out of a trap and threw a high loopy pass between A2 and B1. Both players jumped into the air to get the ball and the inevitable collision occurred sending both players to the floor. The official whistled B1 for a "push". I asked him at the 1/2 how he determined the foul to be on B1 and he said that "the offense has a right to the ball". I had never heard of such a rule or judgement. Did he make something up or is there something out there I don't know and can't seem to find?