By the way, here's the case play from the NCAA (it's AR 85 in both rule books):
B1 takes a spot on the playing court before A1 jumps to catch a pass.
1. A1 returns to the playing court and lands on B1; or
2. B1 moves to a new spot while A1 is airborne. A1 comes to the floor on one foot and then charges into B1.
RULING: In both (1) and (2), the foul shall be on A1. In (1), B1 is entitled to that spot on the floor provided (s)he gets there legally before the offensive player becomes airborne. However, in (2), when A1 possesses the ball then lands on the floor, no time and distance is required.
(Rule 4-17.4.c and .d, 4-17.3 and Exception 4-17.7)