So today a nightelf priest went shadow meld in the arena i was in today at which point it was resto shammy vs disc priest.... After shadow melding, my shammy began to drink and the priest came out of stealth. The priest was just standing there and all of a sudden, his rogue rez's. There was no cast bar and no animation because both me and my partner did not see it. So I believe that the exploit is that if you begin to cast a spell while shadow melded, you will appear to have no animation or cast bar and appear to be standing still not doing anything... Needless to say we lost the battle after the rez