After queue pops and we are 100 % sure our teams are matched,
Team A enters to win the game and TeamB
Close the wow client through Task Manager.
Profit.Alt F4 doesn't work because when u do it you are registered to the Battleground.
Although if u go close the client from task manager, you are not registered anywhere.
Also, forgot to add, this way might work in arena aswell.Although you might get banned if you use it for Arena purposes.
You can discuss such means on quakenet IRC on #RBGwintrade.EU or #RBGwintrade.US or even #OwnedCore
Online IRC client direct connect
RBG channels can be found here
The OwnedCOre chat channel can be found here