Shooter jumps into the airborne defender

[Maverick]

I'll have to get the rule number when I get home to look it up. A player jumping for a rebound is a totally different situation because there isn't any team control and, thus, not extra regulations on the defense. Plus, in that situation, to be undercut implies that both players would be moving out of their initial position. If a player jumps for a rebound and another player moves underneath him/her, i've got a foul on the player underneath.