Please reread my post I do not know how this accident occured and agree most of the time we will never learn the truth. My main point is that if unintended motion protection was mandated these accidents would stop. If they were caused by jumpers-- loss of traction or broken drive machine. The other point I was trying to make is the fact that safety devices like my jumper are not even being taught as an added option to jumper safety! I teamed up with Wurtec to get this product to market to help prevent injury and death.