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Really interesting reading in the case law and jury instructions of other justifiable force cases in FL. I thought this might be useful to pare down what is a justifiable use of force and what is not.
First, as I read the case law, I noticed that Derr is immune from civil liability based upon the statutes.
West's Florida Statutes Annotated Currentness Title XLVI. Crimes (Chapters 775-899)
"\j Chapter 776. Justifiable Use ofForce (Refs & Annos)
oo+oo+ 776. 032. Immunity from criminal prosecution and civil action for justifiable use of force
(I) A person who uses force as permitted ins. 776.DI2, s. 776.Dl3, or s. 776.031 is justified in using such force and is immune from criminal prosecution and civil action for the use of such force, unless the person against whom force was used is a law enforcement officer, as defined ins. 943. 10(14), who was acting in the performance ofhis or her official duties and the officer identified himself or herself in accordance with any applicable law or the person using force knew or reasonably should have known that the person was a law enforcement officer. As used in this subsection, the term "criminal prosecution" includes arresting, detaining in custody, and charging or prosecuting the defendant.
Secondly, I don't think based upon case law and jury instructions that Sara had the right to do what she did. This is from a jury instruction in a FL case:
https://www.flgov.com/wp-content/uploads/2012/06/Bob-Dillinger-Handout.pdf
The use of deadly force is justifiable only if the defendant reasonably believes that the force is necessary to prevent imminent death or great bodily harm to [himself] [herself] while resisting:
1. another's attempt to murder [him] [her], or
2. any attempt to commit (applicable felony) upon (him] [her], or
3. any attempt to commit (applicable felony) upon or in any dwelling, residence, or vehicle occupied by [him] [her].
Why? Because the bikers were not trying to murder her and they had not and were not trying to commit a felony upon her. So, on that view, she had no legal standing to attack them. Furthermore I don't think she meets the sentiment below, where it says the person must believe that the danger could be avoided only through the use of force:
"In deciding whether defendant was justified in the use of deadly force, you must judge [him] [her] by the circumstances by which [he] [she] was surrounded at the time the force was used. The danger facing the defendant need not have been actual; however, to justify the use of deadly force, the appearance of danger must have been so real that a reasonably cautious and prudent person under the same circumstances would have believed that the danger could be avoided only through the use of that force. Based upon appearances, the defendant must have actually believed that the danger was real."
Now, I see your argument that imminent danger is in the eye of the beholder, but that is at the same time a pretty high bar in terms of the law. It is an easy argument to make that Sara had some options to avoid great bodily harm or death. She could have stayed inside. They were not physically violent with her, they were not attacking her, and perhaps most importantly, they were not even trying to breach her dwelling. Her options to use deadly force were zero, based upon further research, IMO.