Just a query - should the chap have taken his helmet off? I know he was conscious and presumably felt his neck was ok, but I'd have thought in the immediate aftermath pain might simply be masked by adrenalin and it would be better to leave it on until an expert arrived. I know if the guy had been in need of CPR, then it would have to come off, but in this case, I'd have been concerned about it being removed.... This is all based on the little I've heard on TV safety films and so on, so I'm genuinely interested. You never know when you might need to know....