Pretty much you can't get caught if your not near a mage "The ones that transport you to the front" What you can also do is fly into the horde bg area and kill there general which i have been doing quite often, you can fly directly into there inn with no problems run around w/e but soon as you get close to the door you get booted out. You can kill the general who gives there pvp daily by standing on the tank in there. What this essentially does is Evades the cast from the mages from removing you from the area. i try kiting that general but its hard not to kill him in two shots or kite without getting grabbed by the mage. By mage i refer to the guards who port you.