my life wizard used team up and ran this instance with one other person (another life wizard).
i killed 3 of the bosses before i died, so i fled and ported back... shortly after i rejoined, my teammate was defeated and she fled, then ported back. we killed the final boss, plus the minions, and all was right with the world... not.
at the end of the instance, neither of us received credit for the quest and we had to start the whole thing over again. a 4-man instance is a long slog for 2 life wizards, so it was pretty miserable; is this a bug, or is that how it's supposed to work?