The HANS is just one little tool... It can only do so much, and to expect miracles from it is foolish. Believe me, if there was something that could magically prevent serious all serious injuries without being too cumbersome or interfering with the sport, I'd embrace it completely.
I did see the video quite a few times... He got up out of the groove, spun around, and slammed the wall with the driver's side, and more to the front that the rear. The HANS won't do anything against blunt force traumas, and the driver's side must have had some intrusion or a partial collapse to cause the chest injuries, unless his belts were too slack and he got flung really hard against the belts themselves or the side bars of the rollcage.
But his injuries will heal with time. It's when your neck or your head is injured, like poor Steve, that you never really come back 100%.
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