In PvP, if you are in PvP situation (or open PvP situation by using red Mode Hans) with the player who did the hur Up or hur down, you can block his way back to your floor by using a Magic/Wild grow wall in the spot.
I think what you tried to say, is that in an opened dolor that allows you to hur Up/down, when the door is closed you are not longer allowed to go back to the spot