Similar to what happened in the first cutscene. This is a mid-mission cutscene that occurs during the Ascension trials. What followed really can't be pared down to a single screenshot.

Killing the boss triggers the cutscene (red glow in the background).

I clicked "skip" because I'd done this before, but found the proceedings amusing.

Immediately following the cutscene the two members die instantly. They had already been "killed" during the cutscene but didn't know it yet.
The two people who dropped will remain nameless but it seemed pretty clear that they weren't interested in partying and just left us in a lurch. I think we still had a good shot at finishing at least the mission (two w/mos, a nuker, and a healer) but not with half the party experiencing insta-death.
Moral of the story, if you're under attack in a cutscene, you are taking real physical damage that is applied as soon as the cutscene is over. In most cases it means the end of the mission so no harm, no foul, but in mid-game cutscenes this could cost you a bit of Time. In this case we found two good people to join us and completed the mission easily.
Thumbs down to those two guild mates.