I had that same experience the last weekly. I felt like i was tearing through everything and they were not helping me much and i even ressed them like 3 times and right before the boss i died and they kept running up and half ressing me and teabagging and running off for like 5 minutes then ran off and died in the boss room after like 20 minutes and it respawned all of us and i just sat there and watched them try to cheese the boss together again and once again after like what seemed forever they get killed and I ran over by them and danced and ran around for a bit till they finally left them added a friend to my party and we finished it in a few minutes lol