The room in question really doesn't seem to function entirely on normal aggro rules. The pulls have resulted in a dead enslaving warlock (our usual alternative to a mage) a number of times in that room for no obvious reason and weird LoS issues for healing. As others have said, it seems like there are weird dead zones within the room that are aggro-free. If in them, mobs will not focus on you.
Additionally, the boss encounter in that room doesn't function on normal aggro for sure. I tank that encounter on my rogue more often than not and try to only go to the instance when specced ShdStep for PvP. I always Sap one of the adds for cc and we are usually able to control another with someone in the party. I get the priest on me 95% of the time without anyone being able to pull her off, even without attacking her at all. I've been in there with a T5 paladin and a T6 warrior tanking - the warrior in particular is able to build more aggro on targets without a misdirect than I've ever seen anyone else generate. There is no way that I pulled aggro off him without attacking anything and have literally never pulled off him in an instance before, even when fully buffed running 1500-1900 DPS. In a 5 man where specced for PvP with really no party buffs I might top out at 900 DPS.
The interesting study would be to determine how the mobs decide who to attack. It could be in combat cc use (perhaps that's been given new global threat?). It seems like I pull aggro on a different mob when I stun the target of my attacks. It could be that they have some sort of linked, funky aggro table, based on globals. I am hit capped on my rogue and regerate energy at crazy rates, which generates 0.5 threat per second.
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Ariashala - Level 70 Tankadin
Ariashley - Level 70 Rogue




