What he put up on FB was he just finished the previous race, hopped on another bike for the next race. He mentioned feeling worn out and really hot. During the race the motor started to sounds little off. So he started on way to the pits. He said he mistook where he was on the track and thought it was the last table top on the finish but instead it was a double and he scrubbed and flat landed. I hope that is close enough to give you an idea. Sounds like he was exhausted, overheated and having trouble keeping his mind on the task. Unfortunately he didn't get to pull off the track like he was going too, and the result is a terrible injury. Sorry if I missed anything, but this is what I remember from reading it a day or so ago.