Chris went back to The Log and took some pictures, which helps visualize what happened. I included a picture of the log in the other post, but you can't see the end where the crash took place:

Usually I just you ride off the end. There should be a print of my face in roughly the center of the large slab of granite! You can clearly see the rock and tree that caught my wheel, starting a catapult actions.

Fortunately, a nights rain washed away the uh, accident detritus.