This is an unhelpful anecdote, but illustrates the potential for falling "right." Got hit from behind by a hit and run driver a couple of months ago. Reconstruction from a witness and the bruises and abrasions to me, my clothes, and the bike makes it clear that there was a big speed differential and I went down mainly on left side and back and had zero time to react in any way. I sustained temporary damage to both ulnar nerves at the elbow, a mild concussion, and a terrific bruise on my right buttock where the ******* hit me, and it took a month for my lower back to feel okay, but the lack of more serious damage, particularly to my 63 year-old bones, was impressive. Wish there were video.