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He has an aggro mechanic that makes it appear as though he as two threat tables (i.e. two heads) when in fact he has a normal one, and a "distracted" temporary aggro table that is typically a random player. O'mrogg will emote (both in chat and in sound), and will "switch" aggro which, when it occurs for the first time, is an effective aggro wipe, except for one person (not the tank) who is assigned a small amount of threat
Actually this one would explain why a shaman that did nothing got eaten even after the pala picked up the boss after the first head switch.