2017-18 NFHS Interpretations, Pt.1

[Scrapper1]

Originally Posted by NFHS

SITUATION 4: 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)

Maybe I'm having a brain cramp, but how is this a violation? How does this not fall under 9-9-3, which allows a player on defense to secure the ball in the air from his/her frontcourt and land in the backcourt?

Am I missing something obvious? The tip by B2 ends the throw-in, but doesn't end the exception for a player on defense. Does it? I feel like this has to be something obvious that I'm overlooking.