[just another ref]

Originally Posted by JRutledge

It basically means that the player is not contesting the player's movement. In other words they are allowing the player to go where they want. Now if they try to hold that position or fight the movement, that is a different story. That is one reason it is hard to decide who is doing what sometimes because both players are moving to keep their position. When one gets and advantage it should be a foul.

Peace

+1

Also, contrary to popular belief, it is not necessary for the defender to fall down for the foul to be on the offensive player.