I forget this case specifically, but remember it happened in Florida.
And Florida has a forcible-felony rider in the lawbooks about using deadly force.
It goes something like this...
If you see someone performing a forcible felony, you are allowed to stop them with deadly force if said deadly force will prevent that perpetrator from seeing through with the forcible felony.
The forcible felony definition is specific IIRC, but the interpretation can lead to vague bits.
For example, a forcible felony would be witnessing someone from one of Florida's private prisons escaping over the wall. Is that a forcible felony? Yes. Are you allowed to use deadly force to prevent it? Technically yes. Realistically, no. Your life is not in danger, so you have no right by law to enforce your right to self-defense, or mitigate the forcible-felony defense since YOU were not in danger.
Now...If that felon escaped over the wall, found a person in a parking lot and started raping them? Then at that point yes, you would be allowed to use deadly force on that person, because they have committed a forcible felony by escaping and now raping someone in public. The forcible felony edict allows you to use deadly force to prevent that aggression upon a bystander.
It is at that point, where the criminal has forced a felony (escaping), and has committed another crime on top that puts another person in danger of their immediate harm or death, that you are allowed to use deadly force to stop said crime.
It is all sticky wickets now, and best left to lawyers.