Wow man, sorry to hear about your wreck. The scary thing for me would be the fact that there's no apparent reason for your spill. The "observer" rules out a car and the bike is fine so I'd have to guess road imperfection, some type of blackout/seizure, or the dreaded squirrel! I would think that if you were about to hit something like a crossing animal or unexpected pot hole you would have said to yourself "OH S***!!!" and recalled the obstacle afterwards, maybe not? I'd be looking into a blackout from something like low blood sugar, heat exhaustion, or some kind of neurological tick. Scary regardless, hope you get well soon.