It’s clear by his reaction that, although the bullet didn’t pierce the armor, he is in a state of major discomfort for some time after the shot was fired. A bullet can go through an engine block, and the distribution of force from the bullet onto the bones and internal organs can cause serious internal trauma.
Shooting a 10mm into your belly to test your body armor is like crashing your car at 60 MPH to test your air bag. Reckless, risky, and possibly deadly. -YouTube comment
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