Pretty justified so far as I can tell. Violent man attacks someone with a shotgun, violent man gets shot.
Travon attacked someone with a gun too. Travon got shot.
Underlying principle here is "don't attack a man with your bare hands when he has a gun."
Especially not a shotgun.
Saint Skittles, Gentele Giant and Saint Jogger all attacked an armed man.
Always a bad decision.