I played 3 matches in Rumble today. All 3 were different lobbies, 2 of them had groups moving as a team. Same thing happened yesterday, people were running together to finish the Imprecation quest. They would kill anyone who came near then would kill each other with Imprecation. When they noticed I was using it they tried to invite me and I promptly left. Fireteams need to be disabled for Rumble or this will never stop.