| Interesting. From what little I can see from the pic and the description of his injuries it looks like the wheel has come back against the wheel arch and crushed his ankle.
I've spoken to several CFS volunteers that have all told me it's one of the most common injuries in country crashes, and an ex-Speedway friend has told me that they often run the roll cage along the floor (under the pedal area) to try to stop the wheel coming back into your feet, and was surprised how many CAMS and FIA cages don't have that (Jap spec cages are even worse, where the front feet of the cage are maybe half a metre away from the pedals and offer no protection to your feet).
So (acknowledging I'm likely talking out of my backside here!) I'd say it's likely the cage didn't play a major role, and what we saw was the crash structure of the R56 MINI at work! (it's a strong little chassis).
R56 MINI Cooper S JCW Challenge | 
