Did Garuda EX for the first time and it was in Duty Finder.
After the first 3 wipes a DPS said,

"At least three people don't know the strat."
I said, "Tell us then."
He proceeded to say some stuff and I trailed off because I didn't understand much of the terminology.
He finished with, "Don't worry about that bit thats the Tank's job."
Another DPS said, "Phew! Glad I don't have to deal with that!"
Then I said, "Hmm... whats that?"
Then he explained again and said something about not killing a Spiny, swapping and 2 stacks.
I said, "Whats a stack? How do we swap? What are we swapping?"
Another DPS said, "Tank sounds like fun..."

4 people left the party at that point.

In the end I told my FC what happened and we did it unsynced. They didn't even need the Spiny they just steamrolled the biach.