I must admit I did this the "naughty" way in Cata or the expac at the time of 01/2013. Alkazaar on his warlock helped me, we found a quiet corner of WSG (up behind ally GY) and he life tapped while I healed. Still took a good 15 minutes, and a lot of (I say regrettably) angry team mates who saw us doing bugger all. I'm sure it was just about do-able in AB for MoP when healing was particularly overpowered.