Normally I would agree here but after my conversation with him, it was obvious that he was just riding to work. It's not often I see someone wearing full gear minus pants riding their bike to work in dress slacks. The bike went down from the middle of the ramp, it was apparent he wasn't going fast and hitting the apexes of the ramp. If he went down from the inside of the turn ( where the debris gathers) I'd say he was riding spiritedly. Even after looking closer I couldn't see where maybe he leaned to far in and maybe dragged the foot control/ peg on the inside ( that would have left a gouge mark in the pavement). There was one skid mark left by the rear tire that lead right to where he layed the bike down and into the guardrail. It's like God reached out and swacked the bike out from under him.

I really know very little about bikes, but maybe the changes he made to the rear suspension drastically changed the way it handled and braked.

I didn't handle the crash though...