Skinning up Ridgeline out of Lamb's we remotely Triggered this slide from about 8900 feet. It seemed to have failed on the layer of buried surface hoar underneath the snow we got on Presidents day. The average slope angle was about 35 degrees with 37 degree convex roll-overs. The Top of the avalanche crown sits at only 31 degrees, leaving some lower angle hang-fire above. Anticipating seeing some activity today, we intentionally hiked closer together as a threesome toward the top of the ridge when this released, I think the weight of our group got this one moving, though it was quite sensitive. After this slide released, an extension of the main slide sympathetically released as we skied a nearby slope making the total width of this slide around 400 ft.