This MIGHT be useful for something.
I'm not sure if, or if not though.
I know most people think they fixed all the method's of coming into the Brawler's guild arena by using spells etc, but that's not what happened.
So basically a rogue just shadowstepped me inside Brawler's Guild while I was fighting, and he could damage for about 3 seconds then he was teleported out again.
Someone with a brain must be able to find a way to use this in a nice way, for example using the lag tool so you don't get teleported out etc. I don't have time to try myself and I don't have a rogue. Just found this interresting.