A few weeks ago my right foot slipped while walking on the slippery concrete sidewalk next to a supermarket -- i had stepped out on the very edge of the sidewal

A few weeks ago my right foot slipped while walking on the slippery concrete sidewalk next to a supermarket -- i had stepped out on the very edge of the sidewalk (next to the actual asphalt roadway) to let someone pass with their shopping cart. I was too sleepy to quickly realise what was going on and quickly reposition my right foot, so I just fell like a stone onto the edge/curb of the sidewalk. I thought I was a goner, as my sleepiness had sent my reaction time to shit, and here I was, falling onto concrete and asphalt -- right above the hard right-angled border between them. I then found myself lying on my back, clutching my purse, literally stunned silent; I was unable to verbally respond to any of the people who were asking me if I was OK or if they should call 911. According to the initial/final positions and my injuries -- there was a wide (about 8cm wide) abrasion from below the middle of my left shin all the way to right below my knee -- my fall training had nevertheless kicked in. I'd let my lower leg make contact with the curb edge as much as possible and then (judging from the injury) once the contact point was almost at the knee, I rolled onto my buttocks/back (onto the sidewalk). I'm still shocked I walked away with no head/neck contact (no TBI for me) and no broken wrists -- and so were the passers-by! The abrasion seeped blood for a day or so, but that's nothing compared to the other possible injuries from slipping and falling onto concrete and asphalt. I'm so happy my body found a safe way to dump about 1kJ (CG height * mass * g) in about a second -- anything else might have been disastrous.