Bodycam footage was just released
she was running with the knife at the other girl, he shot her to stop her.
He prevented another girl from being stabbed with a deadly weapon.
Had the other girl trapped against a car and was trying to stab her.
Isn't there a stand your ground question here, legally? She was on her own property. Not sure how the law applies here though.
That being said in other circumstances there almost certainly would be people defending her as standing her ground/defending her property.