It looked/sounded like he kept chopping the throttle a lot in the turns. i noticed a few times he was getting super close to the edge with no kind of rumble strips and that last turn before he crashed looked mighty dusty.
My guess is the rev limiter broke the tire loose. My MV would hit the limiter and that was just like hitting the killswitch. It did not have any soft limiter on it at all. I would put my money on that. I know lots of honda guys nix the soft limiter with the power commander on race bikes. I didnt hear a throttle chop until he was off the bike.
Looks and sounds like he was in to low of a gear to high in the rpms and fucked up by giving it gas and lost the ass end. In turns throtal control is key be easy be gental that bike has a lot of power especially in the range he was in rpm wise.
But I never knew BMW's would fly that well lol. Sucks but at least he got back up