1) green shirt 100% deserved to be shot, mainly because hes a fucking retard...
2) black (navy blue?) shirt is going to be convicted of Murder 2...
its really hard to argue you felt your life was in "eminent danger" when you are able to slowly saunter into the house to get a gun, and then leave the safety of your house to confront a retard with your rifle......you are actively putting yourself back into "harms way" intentionally.
the fact that they were both arguing back and forth, and pushing and shoving, without any real punches being thrown, is going to make it hard to argue you saw him as a threat, and that you were not a willing combatant....
at the time he shot him, he was 7-10' away, the green shirt guy was not advancing towards him, and he was unarmed.....
...black(navy blue?) shirt guy re-instigated the argument with him...if he was truly "in fear for his life"...he could have very easily called the cops when he went into the house...
like i said, green shirt guy is a retard, and for that deserved to be shot.....but this is going to be a hard sell claiming "self defense"....