These are a sequence of captures taken from the giant whistler wipe-out. Notice the graceful acrobatic dismount technique, coupling together an arial tree-grab, followed by the flying-bike duck...
You can see this in action in the Ride don't slide video to be posted shortly!
Ducking the bike, as it narrowly misses removing my head - which actually might have prevented me from trying this again and actually hitting the tree dead-on!