If you have a source, I'd love to read it.
And at what speed does that happen?
But like I said, if you were to jump out of a 3rd story window, and land on your butt (the safest body part to land on), would you prefer to land in a pool of water, or on the concrete sidewalk?
A better example, imagine going to a pool with a high springboard, say 3 stories above the ground. Imagine the difference between jumping off it and landing in the pool, or landing on the concrete beside the pool.
Look at my edit :p