G force is what kills. When you fall and land on a hard surface, you descelerate very very quickly. From what ever speed you were going to stop. At a small distance that might be just a few Gs of force. As you get higher, that number gets higher. Eventually, the g force you would experience would be too high for you to survive. Hundreds of Gs, even thousands.
To prevent this, you just need to spread that force out over a longer period of time. the longer time you take to slow down, the less force you feel.
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