Just did Sastasha normal, didn't think it was possible but tank managed to wipe the party on mob pulls before first boss. Right after the rez at start animation finished I noticed both tank and healer has the D/C icon then shortly after they are both offline.

And of course either of them ever came back.

I want to give them the benefit of the doubt, but my intuition tells me they are trying to cheat the system because I seen this kind of stuff before. I just want to make sure I'm not imagining things and other people seen this too.