I have a warrior tank and the champs phase of H ToC is giving me a headache. I can't seem to get past this phase consistently when I'm presented with the Deathstalker and a ranged DPS. I can't seem to maintain aggro on the ranged dps while I kite the rogue around staying out of the ground poison. Invariably, my healer grabs aggro and gets nuked by the ranged dps, and we wipe. Does anyone have any tips or tricks for tanking this particular encounter?