I ran into this issue – the Asari got killed then wouldn’t move after he was revived. I had to quit the instance and restart. I was able to complete the quest the next time by being very careful with the pulls so that he didn’t die. It’s not a bug persay since it is possible to complete the quest – but it makes this quest very, very hard and frustrating since it is so long and you have to do the dialogue at the beginning every time.