Guild Wars 2

Bug: Final Seal does not die when brought to zero HP
Bug: Legendary Archdiviner continues to channel spawning an unlimited number of baddies

Server Northern Shiverpeaks

Description:

I wrote this up a while ago, but I am not sure that I did a very good job of explaining it. So hopefully this will be more comprehensive and be able to get an answer.

The cliffside fractal works totally fine until the very final seal. The battle at the head seal goes well, until you get the legendary Archdiviner to zero percent health. At that point he drops the hammer (as he should) and you can use the 4 skill (we call it the boomtang in my guild) to destroy the final seal)

However this is where it gets wonkey

The seal goes to zero health, but does not dissapear. The Archdiviner continues his channel skill and restores his hp, meanwhile an unlimited stream of mobs keeps spawning and killing us. We are unable to use the hammer on the zero hp seal. And inevitably we all wipe due to increasing numbers of fodder.

This has happened at least 3 times to groups that I have been in. And It makes me terrified to run this particular fractal. Both of the previous times that it happened it was our last fractal of the day, ending up wasting several hours.

Some help on resolving this would be greatly appreciated.