1) doAddThreat call instead of AddThreat. ThreatCalcHelper shouldnt be called. Otherwise, the value of the threat that will be added to the caster will be multiplied by a threatModifier (about 1.6)
2) Taunt should give the caster the same threat as the one in the top of the list. If player A has aggro with 1000 threat, player B has 1050 threat and if player C taunts, player C should have 1050 threat after the taunt and not 1000 (the difference can be much bigger with ranged players).
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