SKs, quickest threat generated if you've got an overpull on your hands without CC and mobs gouging out the cleric's eyeballs from heal aggro.
Just dot away with low cost spells and they're putty in your hands. Obviously a knowledgable healer can ghetto CC with root, but for the first 10-15 seconds you want them all on the tank instead of running loose.
Paladins aren't far behind, but they aren't SKs
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