During the second story mission at the boss I came across a bug last night. Right when the conservator was about to teleport everyone to the void I used her ultimate to regain the life. Everyone on my team was teleported away except for me. I was left with the boss to myself and I ended up getting its life bar to zero. It did not die though and when my team was done finishing the void part they teleported back to the boss, and its life bar was reset to where it was when they were teleported away.
Interesting, it was the opposite for me. I was stuck in the void while my teammates returned to the boss fight.