There's a challenge called Petra's Run that boots your team to orbit if anyone dies at any time.
Thing is, the raid is not considered over until you pop open the final chest...

(No real spoiler)

The most heartbreaking end to any stream, 100% on me, we'll walk the walk tomorrow pic.twitter.com/0J2VsxLDqA

— Char (@CharOnTwitch) October 5, 2018