Oh yeah, i have had a taste or two of "WHAT THE HELL JUST... Oh. Oops".
But yeah, I got the chance to try it on the sisters today, and the runner fell off, and we only started damaging the second sister with 15 seconds left. Still killed her.
Which is quite funny. First time I ran the raid, it was tough. Second time, not much easier. Third time, easy as pie for some reason.
Looking to do it again tomorrow for the first time on my warlock. If you haven't already done all three characters, maybe we could team up? We definitely need to play together at some point!