Great little vid that. Was up there yesterday, coming down at about 4.30 was nice and quiet on Rangers... done it quite a few times but yesterday (at about 2m40ish on your vid) my rear mech caught something and snapped off, gears into the wheel/frame and bike launching me over the bars and onto my face. Bust thumb and nose and a rib judging by my breathing today, had to do the rest chainless which was a right pain.
Up until that point it were a cracking day with not a cloud in the sky. Great ride, will be back in October.