I see what you mean. Sadly it's the red flashes on his England rugby shirt being distorted over You Tube, not some unidentifiable but vital body part bursting on impact.
A lot of those guys are pretty messed up by the bottom of the hill though. A couple of years ago the authorities tried to stop the event and the St. John's Ambulance were pulled from giving medical support. So the hardcore ran it anyway at dawn. As I said above, broken bones and dislocations aplenty.
On the subject of ferrets, they are lot less frisky as they get older and have had plenty of human contact. That being considered I still wouldn't want to put one of the pointy teethed little feckers down my strides.
The rationale for reduced gin intake and the knowledge of the perils of alcoholism and attendant metabolic derangement has almost entirely come from physicians and researchers.