Once you have pulled all the mobs (If it takes you more then 7 seconds to pull the mobs, you are doing it wrong), you use Blinding Light (Disorient), followed by Divine Protection. At this time, the DK will have poped Remorseless Winter, and the Disc should continue doing his best to shield you while you start your rotation. After the Remorseless Winter stun has faded, your Boomkin should pop Solar Beam on the adds, and your Disc Priest should use his barrier on you, and continue healing your ass off. Once Solar beam ends, the pack should be about 40% health, and you start rotating major cooldowns- Pain Supp+Argent Defender, followed by Guardian of Ancient Kings. Should the pack NOT be dead by the time Guardian of Ancient kings expire, Boomkin should use Ursol's Vortex while you kite the HELL out of there- should the pack NOT die after Ursol's Vortex, the Priest's spirit shell should be up, and your divine protection should be up, so you can tank them for another 12 seconds. If the pack of mobs is not dead yet, well, you need some better dps.