He just gave his opinion of how he think it should be. Stop always being so condescending towards other people.
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I haven't researched it too well, but I think mythic Gul'dan is impossible to solo for some classes due to the illidan debuff? Some classes can avoid the debuff but other cant.
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Why do you keep arguing with him based on a technicality. Do you have a need for him to admit that what he said was technically wrong?