гипоксия при высотных прыжках

So, we went skydiving, and they had some special loads that would go extra high. Usually we jump at 12000 feet, but this one went all the way to 21000 feet. But something appeared to be wrong with the oxygen system in the cabin, or something other happened why we didn’t got enough oxygen. Anyway, I passed out, my friend woke up at 12000 feet falling to the earth, after he unknowingly jumped out. Neither of us can remember the jump, but we got it on video. I made a jump the same day, about an hour a