This may help:
Self-defense laws in the US typically justify a person’s use of lethal force in public in situations where lethal force was necessary to prevent imminent death or serious bodily harm to themselves or another person. Traditionally, these laws have been clear that
taking human life is not necessary, and is therefore not justified, if the person could have avoided using lethal violence by retreating, or simply stepping away from a confrontation. A person does not have a duty to retreat from a conflict before using force in their home, however (known as the Castle Doctrine).1
Stand your ground laws upend centuries of legal tradition, allowing a person to use deadly force in self-defense in public, even if that force can be safely avoided by retreating or when nonlethal force would suffice.
Wisconsin Law
Wisconsin does not have a stand your ground law.
The state’s case law allows juries to consider a failure to retreat when evaluating the necessity of a person’s use of force in public.2
Wisconsin does, however, allow for the use of deadly force without a duty to retreat in defense of an occupied vehicle or business.
https://giffords.org/lawcenter/state-laws/stand-your-ground-in-wisconsin/
He was obviously retreating from Rosenbaum. He stood by Rosenbaum after shooting him. Once the mob screamed , "Get him!" he had no choice but to run.
He showed remarkable restraint under the circumstances to not shoot a guy that backed away from him when he was on the ground. This is pretty much open and shut. The only reason he's going to trial is to appease the woke, antifa and BLM.
He might get convicted of something but not murder or even manslaughter IMO. In fact I'd bet on that