Looks like its the 4 wheel brakes that weren't working in that video, how would 4wd help you go down an iced up hill? I see more yahoos that think their 4wd will somehow magically help them stop, and I've seen lots of them wipe out too. I think the first one of those was 4wd or awd also, he tried to power through it and f'd everthing up pretty good.