Me and my feral buddy were doing some arenas and when he used displacer beast facing our door (out from the arena) he went straight trough it! We invited some classes with blink-like abilities and we soon discovered that any character that can blink forward can get trough the wall. I believe It's possible to do this to get higher rating by waiting them out.
Doing so may get you banned so i did not do so.
If you need a partner to do this with, just leave a comment below and you guys can meet up (If you're on the same server) to get to a high rating
As always, good luck in Azeroth!