I went there many times, never had an AOE problem.

A couple of things:
Invisiblity works on everything I have seen in there. This is a good thing
:)

The Chief stands on a ledge, interestingly, there is very little agro
between the area below the ledge and the ledge itself. We were fighting
right under the Chief (almost) and he did not agro on us. I did NOT use AOE
in that spot though.