I am glad both @slapos and @Chris C were relatively ok!! That video is a classic example of stupid people doing, stupid things.
@Chris C, When you get better and ready, please let me know! In recent years, I came to realization that no matter the rule or enforcement, I cannot fix stupid and all I can do is change my ride and look the rear every 2 turns. It helped me to see the straight liner wearing football jersey on Rosi's Run at Copper Mtn .......... I tends to stay away from people who has sports jersey...... I still don't see how this is "cool"
Maybe I need small camera facing rearwards .. "Ski Dash Cam"