Some years ago i fell from a height to the ground (around 10 feet), right on my back and stopped breathing for some 10 seconds. A sudden complete cut off. I am curious what stopped the air. Either the windpipe was squashed by the ribcage, or was temporary stifled from the very impact without having been squashed by anything, or lungs temporarily collapsed or deflated (not sure whether these are the right words to describe it) and blocked the air from filling up? That was a sudden complete cut off.