[Raymond]

Originally Posted by Nevadaref

So you don't believe that this part applies in this situation?


RULE 4, SECTION 3 SETTING DIRECTION OF INITIAL ARROW
Alternating-possession control is established and the initial direction of the possession arrow is set toward the opponent's basket when:
ART. 1 . . . A player secures control of the ball, as after the jump ball.
ART. 2 . . . The ball is placed at the disposal of the free thrower after a common foul when the bonus free throw is in effect.
ART. 3 . . . The ball is placed at the disposal of the thrower after:
a. A violation during or following the jump before a player secures control.
b. The free throws for a noncommon foul.
c. A common foul before the bonus free throw is in effect.
NOTE: This procedure is used only to establish the alternating-possession procedure. See 6-4 for using the procedure and reversing the possession arrow.

I go with setting the initial arrow to Team A once B1 has ball at his disposal for throw-in. I would consider that as "A player secures control of the ball, as after the jump ball."