Today i just tested several things out with my Rogue,
it requires Drums of Panic / (Walls / Mountains etc.)
and Shadowstep.
First of all you watch out for a target / you need a mob or somethings thats fearable and walks into a wall mountain or something similar.
If this happends Shadowstep the target and et voila.
With this i was behind the walls in Shattrah, under the Mountains of Zangaramarsh and several other places.
acciedently tried it in shadow labs, and after 4 minutes of freefall i convinced a friend of me to port me.
Not really an exploit but maybe usefull.