[WhistlesAndStripes]

Player A1 is dribbling, closely guarded, at the top of the key. He picks up his dribble, and is still closely guarded. As I get to 4 in my count, he turns toward the back court, away from the defender, and simply drops the ball. As defender B1 attempts to get around him to retrieve the ball, A1 pushes him. I call the foul.

Is there team player control during this time that the ball is bouncing after he has dropped it, and is this a team control or player control foul? Please cite rule references to support your answer.