Did you end up reseting the quest? EDIT: After a few minutes (around 10), the door re-opened for me. Though as others have said, the fight is quite buggy. First two times i tried it, no spheres showed up. I did it again for the weekly after i completed it and then he did his "light/dark side" skill twice. The first time it went as it supposed but the second no spheres appeared.

Don't know why you guys are making such a fuzz about tolerance. When i tanked it with my sin it was rather simple. Main tank has aggro untill tolerance is being casted. Just before the cast is done the other tank taunts and keeps aggro untill stacks are cleared. 2nd group of adds (which is the one that really matters) just needs kiting.