ORAC,
That lady is all over the news here in Australia, she has frost bite all over her face, her height was approx FL250.
one thing i want to highlight is:
“There’s no oxygen. She could have suffered brain damage. But she came to again at a height of 6,900 metres with ice all over her body and slowly descended herself,” said Godfrey Wenness
Firstlly im sure there is oxygen at height, and i know that the reason someone loses conciousness is because its the brains' way of protecting vital organs, shut down the rest of the body and use the oxygen coming in (at very low pressure thou...) is used to protect the brain, heart etc....
Same way as on a cold day, the body draws the heat away from the skin to keep all the vital organs at normal temperature and need be, it will shut down all functions to protect the organs.