I just had this weird experience in expert roulette today, it was the newest dungeon.
Tank started with this odd explanation of the final boss, at least that's what i think it's supposed to be, and then proceeded with single pulls.
I ask them to do big pulls and at the third pack i used rescue to push them in doing so, tank runs back, but they ended up losing aggro on some enemies which went after the dps.
I tried to keep them alive, but the dps decided to run all the way back to the beginning of the dungeon, so they ended up dying.
At this point i was thinking about leaving, the tank stood still and was wondering how this had happened.
After we regrouped both dps suddenly decided to just go ahead and pull the next pack alone, while the tank was still just standing, i didn't ran with them, so they died.
We were over 5 minutes in this dungeon at this point so i decided to try to kick the tank because there were just standing there and writing the entire time, i didn't believe it would work because it is obvious that this is a premade group but guess what.... it did.
After the tank got kicked, the other 2 dps left with them. The new group had no problems at all to do the dungeon normally.
I know i was acting rude and i do feel bad, but this isn't a super hard dungeon, it's the same as any other, so i thought it was weird that they were making such a huge deal out of it.
Here is the chat when this happened, I played white mage, blue was dark knight, orange was bard and red was summoner.
I checked after the dungeon and all three of them were in the same FC, tank and one of the dps had the same last name.
https://i.imgur.com/MBroj0B.png