Things have changed since 2000-2001
As I stated earlier, in 2004, They rewrote Rule 9-9 to include a 3rd article. It says for an exception to a Backcourt violation, a players has to legally jump from the players
Frontcourt from a Jumpball, Throw-in or while the player is on defense and have a normal landing.
So what if during play a defense player (B-1) jumps from their Backcourt, while in the air B-1 intercept and controls the ball. B-1 lands 1st foot in the Frontcourt followed by the 2nd foot in the backcourt. Violation? Or Play on?