There were several dozen other images as part of sequences that also
showed some of the gnarly action. I don't have time to adjust/level/crop
all of those, so what you see below is what I saw through the viewfinder ...
some great hustling play out there!
Note that the Canon 7D shoots at 8fps, so the stop-action animation
is almost like a movie if you speed it up to that rate.
Use the controls to play, step, pause, slow-down, and/or speed-up the animation.