This was triggered just off the skin track riders left side of the track on the way down. As my buddy skied up next to me, the supporting layer of snow at the bottom of the slope was removed and this broke, propagating about 40ft. It was a small slide, so it only came up to our knees. The crown was just below the support from the brush/ trees above it. Looks like it broke on the new/old snow interface. This was on a pretty steep and short slope, about 50 degrees. The photo is taken at the bottom of the slide. It only ran about 20ft.