Isn't that clip from one of the 'Crusty Demons of Dirt' DVDs? It's the same one that features Seth Enslow's demented leap from the top of a dune... about 5 seconds of air and a horrendous wipeout, followed by film of him on the stretcher, bashed to hell, saying "I don't need a doctor". A very strange breed those motoX chaps.
GC