Setting Initial Possession Arrow?

[Nevadaref]

In your play A1 commits a violation by knocking the ball out-of-bounds prior to any player establishing control during or following the jump ball. Therefore the part of the rule in RED applies. Since the thrower is from Team B, the possession arrow will be pointed in favor of Team A unless something else happens prior to the throw-in.

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.