Ok, well this was a little trick/exploit that I found out the last night while wondering around the outlands. I found it out by myself and I dont think that it has ever been posted so here it goes...
I was on my level 57 orc warlock in the outlands wondering around hellfire peninsula when I decided that it would be a good idea to go through the Dark Portal so I went through with no problems...
I popped out at the Stairs of Destiny so I spent a little while wondering around there, realized there is nothing for me to do there and left... almost...
when I was trying to go through the portal, it says "you must be level 58 to use the portal" or something along those lines... so I was all "WTF? my hearth stone is still on cooldown!!!"
so I just kept running forward until I hit the "Invisible wall" about five yards through the green barrier and sat down while I waited for the cooldown to be up on my hearth stone.
Then I saw a level 61 human warrior go through the portal and i was all "OMG!?!?!? Can I kill him?" and then I was like "Oh yeah, im a warlock, of course I can!" so i used immolate, then corruption, had my felguard charge and stunned him, and shadowbolted him twice, then he charged me and got ported out!
The point is, if you can (as a level 57 or lower standing in this spot) unload enough dps before any non-ranged class knows whats going on, they can do nothing (that I know of) to stop you
If you like it, post.
If you don't, flame.
*sorry for no screenies* my internet connection is to slow to play WoW right now