I'm sorry, most of my answers are from yesterday and it was my first day here - didn't know that I should update answer after posting any additional info in the comments, thought it's just a form of discussion on the answer not obligating to edit it.
About the source of information - sadly I don't have any evidence that I can show you, I'm basing on my own and my friend's experience. We didn't manage to get both there at the time while doing my quest and Fugue disappeared.
Updating the answer tho, sorry for the inconvenience.