Puppycow
Penultimate Amazing
A blow to the head can cause a psychosis: Inability to distinguish thoughts from reality. He THOUGHT he was being attacked by the people who were helping him up? And defending yourself, or ypur kid, even from unreasonable fear, is legal.
I'm not sure about that highlighted bit.
There's probably some kind of "reasonable person standard".
https://en.wikipedia.org/wiki/Self-defense_(United_States)
(Emphasis in original)In the U.S., the general rule is that "[a] person is privileged to use such force as reasonably appears necessary to defend him or herself against an apparent threat of unlawful and immediate violence from another."[1] In cases involving non-deadly force, this means that the person must reasonably believe that their use of force was necessary to prevent imminent, unlawful physical harm.[2] When the use of deadly force is involved in a self-defense claim, the person must also reasonably believe that their use of deadly force is immediately necessary to prevent the other's infliction of great bodily harm or death.[3
In some jurisdictions, there is an imperfect self-defense rule, where an individual who mistakenly believes that he was justified in using deadly force in self-defense, but is not legally justified, may have a murder conviction reduced to a manslaughter conviction instead.[10]
So not just any old belief, the general rule is that it must be a "reasonable" belief that the use of force was necessary to prevent imminent, unlawful physical harm. Perhaps the "imperfect self-defense rule" would possibly apply in this case. But that doesn't get you off the hook entirely, because he would still be guilty of manslaughter.
https://www.shouselaw.com/california/murder/imperfect-self-defense.html