I honestly don't know if this man killed in self-defense or not. There is no doubt that he killed the other man.(In front of a group of children)
It sounded like things went to hell very quickly in what started as a minor neighborhood verbal altercation.
I could almost say the same of the Zimmerman case.
I think the dead guy tried to disarm the shooter after he brandished the weapon. As I recall from news articles the shooter brandished it and threatened the kids.