So after hours of waiting around for Rana to be able to be spoken to, the quest finally allowed it. However, I didn't get a chance to even talk to her before the quest was completed by random people not even in my party. In fact, the text popped up twice that the boss was beat. That quest has been buggy since beta.
This is the problem I have with ESO. Random fights I have no problem being helped with by non-party players. I do care when non-party members beat a key quest "boss" for you. That should only be allowed by the person who had initiated the quest and any party members. It takes the fun out being immersed in the stories.