I would have killed the kid, well, at least shot him with the gun. Think of it this way a retired old man whos only passion is his yard, he was fanatical about it. He mowed it several times a day and measure the length. The kid had been screwing around with his yard for 5 years. I can see why he exploded, the kid isnt some innocent little boy, he was harrasing the man till the brink of him killing him. A peacefull quite old man does not go and shoot a 15yo boy for no reason.