Seeing people wear that 'armour' bugs me. It's made for mountainbiking and/or motocross, mostly to protect from roost (mud/rocks flung from riders in front) and bumps at lower speeds. It serves no purpose on a road bike, and certainly doesn't protect from road rash. It's no substitute for leathers with armour made and tested for motorcycle use.
Who cares if it's hot, being warm in the proper gear is a lot more comfortable than a skin graft.
Watching the slomo its difficult to tell if her foot got ripped off at the time of impact with the car, or upon impact with the ground (but as it was her left leg, which was the side the car hit, more likely at that point).
Could proper biking boots have helped prevent that injury?
The guy actually carried out a near textbook roll over his back, probably done that a few times!!!
I'd say the body armour in this case helped cushion his landing...
Alot of deaths also occur where the rider goes straight into the side of a car, body keeps travelling, head first, resulting in fatal head/neck trauma. The Two in this video were fortunate from that point of view, as the impact occurred on the front wing, hence they cleared the car relatively intact.