I was thinking the "backfiring" and associated flame was probably his rev limiter kicking in. I sure hope that was his own bike. He's probably down at his dealer trying to get a new bike on warranty. If not, he's at his insurance company. Either way, he's an idiot. I thought it was interesting that nobody paid ANY notice to what this fool was doing until it went up in flames. Must have been a common behavior for that group.