Google "disparity of force" and reasonable fear of great bodily injury or death. If you can articulate why you reasonably felt that you were under imminent threat of great bodily injury or death, then you can legally shoot an unarmed assailant. A young, physically fit, assailant against an older victim certainly qualifies as disparity of force.
Regarding home invasion, read C.P.C. 198.5 It might not be a good idea to use deadly force against someone that you know is unarmed, but if someone breaks into my home in the middle of the night, I'm not going to any great trouble to determine whether he's armed or not, because the law says that my fear of great bodily injury or death is a priori reasonable.
Ryan
Regarding home invasion, read C.P.C. 198.5 It might not be a good idea to use deadly force against someone that you know is unarmed, but if someone breaks into my home in the middle of the night, I'm not going to any great trouble to determine whether he's armed or not, because the law says that my fear of great bodily injury or death is a priori reasonable.
Ryan

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