Some states have "third party intervention", some don't.
In SC, it's stated:
"The right to take the life of an assailant during an unprovoked assault extends to any relative, friend, or bystander if the use of deadly force is necessary to save the victim wrongfully assaulted from imminent danger of being murdered by the assailant, if the assault is malicious and unprovoked and with a deadly weapon, with the apparent malicious intention to take the life of the victim and thereby commit murder, and if such murder is imminent, then any relative, friend, or bystander has the right to take the life of the assailant if necessary to prevent such murder, provided there was no other reasonable means of escape for the victim so assailed, and provided both the person assailed and the person coming to his defense were without legal fault in bringing on the difficulty."
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