Apparently it was wet and the guy hydro-planed, lost control and went off the road into into a cement set of stairs. That's what the owner says, he posted a comment somewhere saying he wasn't fooling around after he got out of the hospital. It has something like 500 or 600hp, so i can imagine it must be a handful to handle. Wide ass tires also hydroplane pretty easily, so who knows.
There obviously was alot of people assuming and spreading rumors that he was speeding and all kinds of shit, but who knows.