I saw a shaman using this in the US Stormstrike battlegroup the other day, and came here to check to see if it was an exploit or if he was just really laggy. Luckily, this thread was here!
He would use it when he got kidney shot and it would look like he ported about 10 yards in front of me, so I would run over and try to dps him, only to realize I can't hit him and then when he stopped clicking he would be back where he was when I kidney shotted him.