Walking into camp, I learned quickly that there had been an incident with one section of road and a few velomobiles. From what I heard, at one point the shoulder of the road narrowed but the rumble strip remained. At least two velomobiles were thrown around. I wasn't there so I don't have all the facts. It's my belief that the rear wheels lost traction and slid sideways. Once traction was reestablished, like a motorcycle sliding it's rear wheel, the velo would high side.
Two riders were very lucky making it through with just a shake up. A third velomobile had no such luck and it was rolled. The rider didn't come through unharmed. He had several nasty looking abrasions and or lacerations.
When I was talking to the rider, the velomobile was at the overnight camp on it's right side. I was only able to see the top and left side. Both had scraping damage and I was both shocked and surprised to see the top side of the velo with substantial scrapes. Besides being rolled, the velo must of slid upside down for some distance. Though in shock of the situation, the rider appeared to be in good spirit while I talked to him and as friendly as ever.