I doubt this. But did u eat his shrieks every chance you got and managed to live with no defenses up?
Cause if you didn’t do that, you followed mechanics.
And I have tanked raid bosses outside of LFR past the enrage timer too. Solo. It happens sometimes. if you have enough CD’s you can do some cool stuff. Don;t see me claiming that Heroic Garrosh didn’t have any mechanics.
And this is why WoW is not and will never attract new players. And why it will (slowly but surely) bleed players till it is shut down.
Expecting people to study before playing a game is asinine as hell. We are only used to it because that is the culture here, but it’s not normal.