How can someone be killed or seriously injured when wearing a bullet-proof vest?

It was just on a local news channel that someone was shot. They said that the vest may have saved his life, BUT, they said he was rushed to the hospital in critical condition. Can someone explain how a bullet-proof vest can save a life, while a person is still in critical condition? Is it just the impact of the... show more It was just on a local news channel that someone was shot. They said that the vest may have saved his life, BUT, they said he was rushed to the hospital in critical condition. Can someone explain how a bullet-proof vest can save a life, while a person is still in critical condition? Is it just the impact of the bullets on the vest, which is on the person, where they may cause flesh wounds, but not actually penetrate the vest? It seems amazing that a bullet can cause someone THAT much damage when they are wearing something that will stop it's penetration of the body.
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