After watching a strange ski descent we were witness to the same two ascending in a very non typical area near El Rollo to the North. Noticed the slide on one of our laps next door and with one group member still climbing near the crown they caused moving without any panic so we assumed all was good and called it into solitude ski patrol to be safe. About a foot deep maybe 75 ft wide running 400 vertical to the flat. New snow Dirt/Graupel sun crust appeared to be the weak layer.