So i joined ZG from the beginning with 2 guildies and we cleared through to the second to last boss Zanzil, pretty slowly it took us about 1hr. We hit our head against the wall for another 30 mins on Zanzil due to the incompetent Tanks that kept joining. So fair enough the healer gives up, he was group leader, so he leaves we all get kicked. I didnt read about that in the patch notes or is it just a bug that if the party leader leaves we all get kicked?