Part II: Defender drops on hands and knees...

[PSidbury]

Part I post seemed to get a little far afield from the intial intent.

Forget about displacement or offensive foul calling or non-calling and please allow the intent and focus of this post be about the legality of the B-player dropping to his hands and knees.

The ball goes in to the A-forward on the block and he begins to dribble backwards toward the goal.
However… the B-defender who is between A-player and goal immediately drops to his hands and knees (within his space) and… you guessed it… the A-player backs-up and tumbles over B-player.

1) What is the NFHS ruling on this and what would you guys call and on whom?

2) The assumption is that the B-player has "intentionally" fallen to his hands and knees in order to "stop" the A-player, however what if the B-player falls to his hands and knees as a result of feigning injury of some kind? How would we know the difference?

Thanks,
Paul