This is madness. His line choice is like F1 Racing.
http://www.vitalmtb.com/videos/member/Aaron-Gwin-Helmet-Cam-Run-from-Fort-William,13964/sspomer,2
http://www.vitalmtb.com/videos/member/Aaron-Gwin-Helmet-Cam-Run-from-Fort-William,13964/sspomer,2