Confirmed, I'll tell you how to do it more clearly.
Stand in the middle of the steps facing downward.
To your left you will see a square wall and the cage beside it.
Jump from the top of the stairs to the corner of the square wall (not the cage).
if done correctly you will land in mid-air
If you fall behind the cage, delete your hearthstone and un-stuck out.
I'll post pics in a sec.
EDIT-=-
RE_EDIT
Also, I'm gonna test to see if using this can do other things. (I've already found out (since i'm stuck now) that you can get into parts of ZA that you shouldn't be)
So right now i'm attempting to go other places.
TRIPLE EDIT -
I extensivly searched all possibilies of going anywhere else that would be useful, I even loaded up a P-Server and did further testing to make sure I wasn't missing anything, so all in all, this is a very nice exploit, but it can only be used for this.
Oh, BTW
Put everyone up there but the tank....D-Hawk becomes a VERY SHORT FIGHT.