Anyone else run this post patch?

My guild decided to jump in and do a quick no-drake clear for badges and loot. We got stone walled at the first drake (one on the left as you zone in).

As the portal team zoned into the portal to kill the add - the shadow damage aura was hitting so hard we couldn't heal through it. It just curb stomped us. Tried about 5 times, different strats and healing assignments. Best we could do was ~30%.

Normally we zone in and drop these drakes like flies. Since our very first time we've consistently nuked them without issue - until 3.1.