NCAA Test Question

[rockyroad]

Got my "test" back, and have this one marked as wrong and am having a hard time figuring it out why it is wrong. Help me out here please:

A1 secures a rebound off of B's backboard and throws a pass in the direction of the division line. B1 jumps from her frontcourt, catches the ball while airborne, lands with one foot in her frontcourt, then steps into the back court with her other foot. The official calls a backcourt violation. Did the official handle this correctly?

I said Yes...it was marked wrong, and the rule reference given was 9-11-5, which talks about the exceptions allowed for the defensive player to jump from frontcourt, intercept pass, and land in backcourt...my thought process (limited as it is) was that by landing in the frontcourt, the player established frontcourt position and then stepped into backcourt - violation...what am I missing here?