Backcourt Violation - Still Struggling....

[ca_rumperee]

Section 9: Backcourt
Article 1.
A player shall not be the first to touch a ball after it has been in team control in the frontcourt, if he/she or a teammate last touched or was touched by the ball in the frontcourt before it went to the backcourt.
Article 2.
While in team control in its backcourt, a player shall not cause the ball to go from backcourt to frontcourt and return to backcourt, without the ball touching a player in the frontcourt, and be the first to touch it in the backcourt.
Article 3.
A player from the team not in control (defensive player or during a jump ball or throw-in) may legally jump from his/her frontcourt, secure control of the ball with both feet off the floor and return to the floor with one or both feet in the backcourt. The player may make a normal landing and it makes no difference whether the first foot down is in the frontcourt or backcourt.

Those are the rules.

SITUATION 7: Team A is making a throw-in near the division line in the team's backcourt (Team B's frontcourt). A1's throw-in is deflected by B1, who is applying direct pressure on A1. B2 jumps from his/her frontcourt, catches the ball in the air and lands in the backcourt. RULING: Backcourt violation on Team B. The throw-in ends with B1's deflection (legal touch). When B2 gains possession/ control in the air, he/she has frontcourt status. A backcourt violation has occurred when B2 lands in backcourt. (9-9-1; 9-9-3)

Why is this a violation? I understand that the throw-in has ended. But it seems like we have a player (WHO IS A DEFENSIVE PLAYER WHOSE TEAM DOES NOT HAVE TEAM CONTROL) being called for a violation, when 9.3.3 states:

Article 3.

A player from the team not in control (defensive player or during a jump ball or throw-in) may legally jump from his/her frontcourt, secure control of the ball with both feet off the floor and return to the floor with one or both feet in the backcourt. The player may make a normal landing and it makes no difference whether the first foot down is in the frontcourt or backcourt.

I know this has been covered ad nauseum on this forum, but after getting my a$$ kicked by Yerasskicked Referee again today it exposes me as confused about this.

Is B2 NOT a defensive player?