[just another ref]

Originally Posted by BigCat

Here is another thought. Art 1. Player shall not be first to touch the ball after it has been in team control in the FC if HE, SHE or a TEAMMATE last touched or was touched by the ball IN THE FC before it went to the BC.

The "in the FC" language refers to the location of the player when he or she touches the ball. Not the status of the ball. In your play team A has control in FC. B1, located in FC, deflects ball into air. A2 steps into BC. He is now IN THE BC, not the FC. He catches ball in air. Yes the ball had FC status and simultaneously gets BC status when he touches it. But A2 was clearly in the BC when he touched the ball. B1 was the last person located in the FC to touch the ball.

Let me know if there is a hole in this thought.

What is the point you're trying to make? The location of the player and the status of the ball when he touches it are one and the same.