You’re wrong, Chris.
I watched that video several times and the little punk was not initially defending himself against anybody.
There was no credible attack, somebody threw a plastic purse at him.
There is no indication at all that anybody tried to do him harm until AFTER he had executed his first victim.
What we basically have here is a little Pillsbury doughboy Mommy’s boy who got scared and pissed his pants and starting firing off rounds.
Now I will grant you, the little punk probably was pissing his pants in fear (even though that fear was not justified) because he does not seem to be a kid of any particular courage as demonstrated by the fact that the punk ran to his mommy after the deed was done