Yikes!!! Who keeps critters like squirrels, dogs, etc. off the course? I've ridden a lot of fast long twisty visibility impaired descents on a bicycle, up to about 55mph (not 136mph), and have had plenty of opportunities to evade obstacles, moving or not. Been involuntarily airborne a few times. To be sure I enjoy it as one of the most enjoyable activities of my life, but... that video is orders of magnitude more terrifying.