It's stranger than that. While he was out of sight behind the truck he apparently changed back to tennis shoes because it doesn't look like workboots when he's struggling with the gun.
He entered the house. He apparently committed theft (stole the boots). He was guilty of burglary in the first degree, and facing 1-to-20 years, open-and-shut case.
In your very vivid imagination perhaps. But more to the point, how may years do you think the killer and his dad are facing? 20 years? Life?
Zero.