Last time I was in m+ in Halls of Valor with a druid healer who had talented “Adaptive swarm” spell.
He had it on some party members and it moved between players, but sudenly it moved to boss, which it didnt pulled, but instead boss teleported back to its balcony where RP should start before it can be pulled. From there we couldnt pull boss in any way.
We tried to do some aoe near her, we all died, we tried to go Fenryr instead if she resets. Unfortunately, nothing worked, so we just lost m+ keystone.
Also I have noticed that when we were on Fenryr, on phase when the actual bossfight starts (when he is licking wounds), druids’s Adaptive swarm again moved to boss when he wasnt pulled and it reseted his “licking” each time, swarm moved to boss. This fight we could do in a normal way.
Also, if it helps - druid was dead at that moment and pala was ressing him at that moment, when swarm moved to boss and bugged him. On fenryr everybody was alive.