That's the thing, the videos didn't have audio that I heard, nor did it pick up any possible verbal exchange before hand. Should he have started the fight? No, no matter what the other guy might have said, there's no excuse. Should he have come forward after the shooting? Yes. But we can't prove that he knew what they would do. It could have been a spur of the moment decision. He might have egged them on, he might have said "Nah guys, let's not do that." We don't know. All we know for sure is that he fought, then was in the vehicle then didn't report it.
It looks bad in any case. And he did break the law (by not reporting it). But that's all we know as fact. So I don't condone calling him a murderer or even stating that he was in on it. He might have been. But I don't know. I will condone calling him an idiot and someone who is detrimental to the team.