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They finish with telling you to "Ski with a buddy". But... what if the buddy in back falls into the tree well? The guy in front doesn't realize it until he's a quarter mile down the slope!
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This is exactly what happened in almost every one of the "off piste" accidents this year. Worth noting is that -- I believe -- all of the accidents took place just outside the boundaries of well groomed, well patrolled ski resorts, meaning that the victims were in "backcountry terrain" without the awareness or skills.
