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You don't need to break a skull to kill someone. My bro in law died in a car accident fifteen years ago by hitting the windshield post. Trauma of the brain ensued and he died a day later, not a bone broken. In this case, the girl should have been at the very least knocked out and her nose should have been broken.
Squash and melons were used in some helmet tests because they have a similar density to a human head. Just pick up a 5lb melon in your hand and gently knock it to your face and then imagine a 50mph velocity instead...
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