The 10 minute thing is correct, atleast it was on Al'Kabor. It was demonstrated by players there before the server came down. However such a unique aggro mechanic will be very difficult to prove the inception of it. Especially since from 1999-2001 people were still figuring out the basics of the game. You had clerics complaining about the OP nature of Druids and warrior complaining about how good Paladins had it on raids...
But basically, if you're attacking the mob or building aggro in any way, the 10 min timer wouldn't matter. It was only like... kiting a mob around for 10 min without generating any aggro.
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