About 4 other alliance questers and myself were in Alterac Mountains, where PvP combat began with one of our party members and a horde mage named Drinkz. As Drinkz was about to die, he popped iceblock, and then.. seemingly vanished. None of us were able to target him and he was not to be seen, until later.
Minutes later, while killing mountain lions, a ?? hunter named Largozh thought it would be fun to ruin a questing party and attempted to gank us. However, as he was nearing death, he too seemingly vanished. He re appeared a couple seconds later, killed a couple of us, but when he was under the threat of death again, he vanished for a second time. Only to re-appear again.
Drinkz, the mage from earlier appeared once again trying to gank us, and when he was nearing death he would once again vanish, and re-appear. Anyways, it was pretty obvious that this was happening at will, the two were having a lot of fun with us, taunting and what not. Largozh the ?? hunter was hilarious because he couldn't handle a couple of level 30s and needed to exploit to try to kill us. I don't know when this was discovered, but there are a few players running around in this area using this exploit. I hope it gets fixed soon . You guys do awesome work here.