Skier triggered storm slab on Grouse

Though visibility was limited this morning, we observed one natural slab avalanche along the ridge north of Grouse right below a cornice. There was also a small natural avalanche south of the Grouse skin track on a convex rocky rollover in a open area at about 8000 ft elevation. Snow was reactive and seemed poorly bonded at the old snow new snow interface throughout the morning. In the terrain north of the skin track observed whomping and collapsing, particularly in more open areas. I remotely triggered a very small avalanche on a convexity at about 7600 ft elevation north of the skin track. This failed on a density change within the storm snow. 

The avalanche in the photos and description was triggered by another party. According to the person who triggered it, he was 25-40 yards above and to the skiers left of the start zone when he triggered the slide, in the flatter terrain on top of the ridge. Visibility was mediocre as it was snowing fairly hard as we traversed below the slide. From what I could see, it seemed most of the slope had slid and the slide connected over rocky areas. The bed surface appeared to be mostly the new snow old snow interface, with a few smaller sections failing on a density change within the now snow.