OP, thanks for sharing your experience. It makes me consider my attitude about helmets... When I was riding motorbikes I always wore a full face helmet for fear of jaw and eye injuries but on the bicycle I wear a normal half helmet (and no armor either). I'm really only worried about my brain, figuring my wrists or collarbones would sacrifice themselves in a lesser wreck. But there are downhills on my commute where I hit 30, and not in the safest locations. However my motorbike helmet weighs many pounds and isn't really appropriate for cycling, either in weight, airflow, or visibility. What's the solution?