It's true. It was not human error that cause the Thursday crash. A team of forensic film studiers watched the video of the crash on the big screen and in slo-mo. Careful observation determined the chain suddenly and without warning or prior written notice, dropped from the large into the small front ring. However, the forensic team, was only able to positively determine the cause of the crash, not how it was initiated. It is possible John inadvertently touched the shifter and if you have Di2, you know how sensitive the shifters can be. Likely though, according to the forensic specialists, John applied so much torque/power to the down stroke that the frame bent under stress and the chain popped off. Actually, I made that last part up cause it sounded good.
Mark is a long-time cyclist who enjoys poking fun at himself but most especially at his friends. No nicknames or comments are intended to offend, accept them in the humor they are intended.