That is completely contrary to the evidence that he gave verbally, the audiotape of his activities that he made, and the forensic evidence at the scene.
He was not afraid, he was in complete control, and was waiting eagerly for the opportunity to do what he did.
After a fight, any fight the winner can walk away. That's all that really matters. 10-20 years from now, nobody will remember what happened only that society wasn't burdened with the offspring of parasitic criminals and that the family of the old guy was happy he lived after living through a home invasion.
I suspect it's like living through any firefight.... years later nobody cares what tactics, how much ammo or if you "fought fair"... only thing that matters is that you lived and your opponent died.
You and the others condemning this old guy I hope realize that he isn't going around randomly killing teenagers. He isn't going to be released into the public and then teenagers going to school or hanging out are going to be killed. He's going to be at home in his little patch of property and probably keeping to himself unless someone breaks into his house..... if it happens to be another pair of teenage burglars, then I suppose they would die also.
He can even say "I promise I have never and won't kill any teenager that stays off my property without my permission, so help me God". .... and be telling the truth.
I'm glad that we can disagree on this subject and feel that it shows what personal experiences and temperament does to a self defense and home invasion debate.