Additional Comments and photos from Drew Stireman:

My partner and I were on our approach to the Room of Doom in upper Mineral Fork. We observed the WPB landing their ship on the east ridge of the drainage. As they were entering the slope, a cornice released naturally, and broke a sensitive wind slab. The avalanche did not break into old snow. We observed graupel pooling below the cliff bands, which is most likely why this wind slab failed. Not to mention the cornice was a good size box-car.