The government sniper drew what he saw before he fired his shot at her, it was a woman holding a baby.
It was no accident whatsoever, a deliberate shot made at an unarmed woman looking out towards whatever unknown evil men were killing her dog, her son and shooting at them.
He may have drawn a picture after shooting her for a report but I don't see how he could have drawn it before shooting her. She was shot several hours after her son was killed. His body lay in a shed several yards from the house. Randy and the family friend had gone out to see it. (Why I don't know) They were running back to the house, Sandy was holding the door open for them, Randy ran through first and the friend was going through the door when Horiuchi shot hitting Sandy and the baby.
I agree with your legal points.
The account came from the trial, where a book about it was written by the lawyer for the defense. In the book was a copy of the bar napkin that the government sniper sketched after the action of what he saw when he fired that shot that killed a mother holding a baby. He drew her.
It is damning evidence, and the rules were changed just for the occasion.
It was a government hit team that went on an ordered killing spree that day.