His "I don't remember anything, but also I do know I was so frightened I didn't even want to speak to the police that were literally right there" defense is complete garbage; I'm sorry. He KNOWS he was terrified enough to use lethal force on unarmed drunk morons, but he also doesn't remember flat-out lying about absolutely all of it TO THE POLICE?? Please. If he had IMMEDIATELY found the cops, or called 911 and screamed about how terrified he was and how some kids just tried to kill him so he had to start stabbing people with a knife he had for some reason, I could MAYBE see attempting his argument. OR if he'd automatically attempted the tried-and-true immediate defense of "I dunno what happened; I just blacked out!" (not that that often works especially when there is literally VIDEO of the event), but to give a DETAILED recounting and THEN later claimed you were just spewing nonsense at the time because you were, what? In some sort of trance state that makes you imagine fake scenarios??? Sure dude.
He was drunk, the kids were drunk and high and being idiots, the other group were also being drunk idiots, and every single person in this situation should have AT WORST maybe gotten shoved away from somebody. The fact that anyone left in a body bag is bananas, and that's on him.