Last night I was tanking the Sorrows 4-man and accidentally got pulled into the portal. The crow wraith thing showed up too and I had the electro-wizard buff aspect so I thought hey, might as well get Confluence Of Shadows, which as an individual you kill both the mini and the crow. I did that (and it did not take 3 hrs on my tank because I had Mr. Storm mage). We cleared the dungeon. I did not get the achievement. What am I missing?