[thecavemaster]

No, reread my post. If player A is in the air, the space above him is no longer his spot. The space can be disrupted, not the player. Trust me.

Space is a nebulus concept. When the player behind jumps a bit forward, nudges the player in front (usually with the lower body) just enough to gain an advantage, that's a foul. It may not be a "foul" in the post Pitino at Kentucky "foul a hundred times they can only call ten" era, but it's a foul.