Uh, I have a map demonstrating it's use...but I can't post it from the computer I am using, so as soon as I can, I'll post a link...for now, just a summary.
To make it, place one glitched door vertically, and a horizontal door either so that the top of the vertical one touches the left of the horizontal one, or the bottom of the vertical one touches the right of the horizontal one. From here, opening the glitched door will glitch the horizontal door. The top will propel/kill you, the bottom is a platform. If after this, you hit the switch for the horizontal door, it changes so that the top is a platform, and the bottom will propel/kill you.
This gets really interesting if you use two regular doors...try jumping from the bottom upwards with two of them.
The same rules apply with the door's ability to block enemies...From the solid side, they can see you, but cannot fire through, however, the other side offers no protection.
As well as this, I suppose I'll announce a type of propulsion I found a while ago...It's VERY similar to glitched tile propulsion. It involves using the same process used in making a glitched horizontal door on a tile...This glitches half the tile, and allows variation in glitched tiles...not just 5 tiles.
I also have a map to demonstrate this, and I will post and link it when I do the other.
EDIT: Here is the link to the map I made demonstrating how it works.
Stiil need to upload the propulsion. Once I've done that, I might make my next door related annoncement...
