I was skinning up a north facing ridge and meandered onto the northwest facing starting zone of God's Lawnmower. I felt the snow to be rather shallow and decided to make a switch back to the ridge. As I made my kick turn the snow broke 2-3 ft deep, about 10 ft above me. I grabbed a tree as the soft slab rushed by. I had a split second to jump right and hug a large tree as the hard slab broke above me to the ground. I got smashed into the tree as the snow rushed by. We went back later to inspect the debris and it fanned out across the whole runout zone and ran about 1,700 to 2,000 vertical ft. The deep slab failed on a foot of 1cm diamater depth hoar.