Frankly I don't know either why. I entered the temple, then left my group at the entrance and went through the whole area with my main char, solo. I aint going to tell where the pieces are, they aint hard to find at all. But beats me why the main char shouldn't talk to 'that' shadow or anything else.. I spoke to all, smacked all, all alone, no issues whatsoever for me. Maybe it differs per level/char/class/race/whatever, but beats me why. Never had any issues of any kind myself..
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