Let's face it, Sara was the aggressor. If she were in such fear of the bikers, no way would she have walked the 75-100' to the edge of her yard to confront them with her gun. The evidence shows this. Derr is not going to be charged, ever.That video is right in line with my visualization of this incident from the beginning. I think the biker was going dangerously fast to begin with and she pulled into "his" lane without seeing him which pissed him off and he escalated and escalated and escalated it again. You can see ample videos of this kind of thing in YouTube posted by the bikers themselves. They strap GoPros on their helmets and record what they believe to be roads full of "cagers" out to kill them and their heroic videos of mostly punching people's side mirrors off but there's no shortage of videos with swarms of bikers beating on car windows with their helmets trying to drag drivers out of their cars on the street.
I think that in this case this particular biker was much more aware of the letter of the law than Sara and consciously engineered a situation in which he could legally kill her - but she was very foolish to go to the edge of her property brandishing a firearm like that. It would have been a lot better for her mom to have had a video camera than an unloaded gun. Sara would still be dead but we would know if she was objectively threatening the guy's life.