Take a feel of your knee and notice how it is a big knobby bony structure with very little soft tissue around it. Every artery, vein, and nerve that goes to and from the lower leg goes through those little shreds of soft tissue. If a bullet hits the knee it is not much of a stretch of the imagination to think that the bullet or a bone fragment could do serious damage to one of those structures. Reliable stop? No. Risk of lethal injury? Very real, as demonstrated.
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