Was a while back so might not be remembering things exactly.Joined a prat in progress for the story quest.They were already on the last boss when i joined.We downed the boss and a cutscene came up so i watched it.After the cutscense i saw in chat thanks for the group and didnt see anyone near me so i thought when i saw the boss it was a solo thing you did and attacked it.Needless to say i felt dumb and got a few people angry at me.