It's a quest in Coldharbour that is either really broken or just stupidly hard. You have to chase a shadow runner for a distance, all the while not provoking the wildlife or other elves. If you do, you are almost guaranteed to fail. Doing this for the billionth time on PS4, I just do not understand this quest. I'm either cloaked or sneaking, which my NB is pretty good at. Still, he pauses every second (literally) to remark on the odd wildlife or asking what that sound was. I have failed three times today, all because he was startled at... I don't even know. Probably ghosts or aliens at this point. Is there some secret mechanic I'm missing or is this quest just idiotic?