Did he make it into his house? Did they try to break down the door? If not, that is where the situation should have ended ... or rather with the guy being chased calling 911 and giving police a statement.
Now if the 5 guys chased him and he couldn't run faster than them and he knew he was going to be caught and he had a gun and busted a cap in each one of them, that's fine too.
But once his ass is in that house, behind a locked door, and they are outside, not trying to break down the door, not yelling death threats, not armed ... it is HIS ASS for opening up that door and pointing a weapon at them and shooting them.
End of fucking story.
[Edit]
Oh, and that is what separates this story from the Getz case. Getz was in a public open place (subway) and surrounded, not in his locked house.