eroe, there is no requirement that a defender
only jump 'within' his vertical plane'. Good defense would take a mighty hit were that the case. If the defender jumps first, s/he has the right to come down on any spot that was unoccupied at the moment of takeoff. This doesn't have to involve a player in control. A great example is an inbounds pass from the baseline out beyond the 3 point line. It's not unusual for the offense player to leap forward for the ball and for a defender to move into the landing spot.
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