Jump Ball (initial arrow possession)

On the jump ball to start the game, A1 controls the ball in the air and throws the ball to B1.
- The arrow is initially set to White (A1) team.
- U1 changes the arrow during live ball next time down the floor.
- U1, again, changes the arrow back to White
What is the correct position of the arrow?
Why did U1 change the arrow twice?