These mobs come in packs of 8 or 9 and should be burned down by AoE. Have a tank either bind all the guests to him by using his AoE taunt or have all decently armored damage dealers in your raid each pick one or two of them from the pull to spread out the damage and build up some minor aggro on them before initiating the AoE fire a few seconds later. Starting the AoE too early causes all guests to gang up on one player which often results in certain death for the poor lad. When pulling, always make sure that no patrol (Skeletal Waiter or Spectral Servant) is near. These mobs are stunable.