During world (non-instance) encounters, a mage is able to out-heal the healing classes by starting a duel with a party member and casting polymorph on him twice. On the second polymorph, the party member can enter combat and control his character while retaining, for a period, the health regeneration effects of the polymorph buff.
In PvP, our opponents can continue to pretend they're polymorphed if we re-sheep them after they trinket out, so the nerf aspect of this bug is minimal.
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