I noticed on Brandywine a couple days ago we got to the boss on t2c... It was going ok up until the boss started Absorbing all damage and apparently we had to "kill his guards" except nothing spawned. We were just sitting there for a few minutes wondering what the heck was wrong and eventually restarted the fight.

We actually got past him, and to another one of the bosses at the end, and it did the same thing all over again. I asked the tank to run around the adds and see if any of them became activated, but no, the fight was broken. Anyone else experience this? Is it common?