Need an interpretation

[rainmaker]

Originally posted by Camron Rust
".

The purpose of "legal guarding position" is to grant the defender the freedom of verticality and some movement at the time of contact without being liable for a foul. That movement may, of course, only be laterally or obliquely away from the opponent.

A stationary player without legal guarding position should never be called for a block...even if that player is laying on the floor.

footlocker -- the secret to calling this play correctly is the word that Camron uses -- "stationary". If B1 on the floor stays still, and A1 lands on him, or even trips on him, A1 could not possibly have gone straight up and occupied only A1's space. If B1 rolls or slides under A1 after A1 is in the air, whether or not the motion was controllable, I've got a block on B1.