From what I have heard, if the warriors spam taunt and a shamen lays a stoneskin totem and a few of those slowing ones(can't remember what they are called) and IF the rest of the guild STAYS on the back wall the marked will be out of the line of sight of the kitties and will not get attacked. Of course the kitties that sneak out would see them, but should be very few if taunting. They saw not to even worry about killing kitties just to keep them aggroed so we can kill Arlokk faster! If a few sneak out I am sure that we could handle them, but I am inly a lowley Mage who knows nothing of Warrior and Shamen ways. 
     The guy I was talking to is alliance and they use pallys to heal sides and they use bubble when they get heal aggro, but he suggested the slowing totem(grounding?) Just my two cents, that probably arent worth anything but 2 cents!