Generally, I don't think that a crouched or especially prone player should be able to block a running player.

Somebody who is prone should absolutely allow a running player to transcent right through him.

Somebody who is crouched or would just be pushed out of the way.

I am posting this because several times now, players have used the prone position to block exits and paths in order to be able to corner me. It is ridiculous that I can't simply run over somebody who is lying on the ground.