While crossing Lake Mary we noticed a crown line and decided to investigate. We found a 2' - 4' crown line above a steep, unsupported convexity with tracks leading into, and away from, the scene. It appeared that a group of skiers and snowboarders had snow shoed to a jump, and after they finished riding the jump, began riding short, steep features nearby. It appeared that one rider had triggered (red arrow) the slab as s/he crested the convexity to ride the face. It was not possible to tell if the person had been caught/carried or even perhaps even buried, though at least caught/carried seemed likely.