Acting troupe at the Five Flagons turns on my party after portal opens

Something went wrong with this quest.

So the portal opens and monsters start to come out. All the members of the acting troupe have blue circles around them indicating they are friendly, but after killing a few of the monsters that come out of the portal one of the members of the acting troupe says something starting with "Now!" (or something like that) and then all the members of the acting troupe turn bad and start fighting my group. I ended up killing Haer'Dalis and Raelis Shai and whoever else was in the troupe.

I looked at some walk-throughs and they were very different. What happened?

Thanks.