Good for him.
Hope he doesn't get in trouble for coming to his daughter's rescue.
The article quotes Arizona state law that extends the right of a person to protect himself from imminent danger to a third person as well. There's a caveat statement that says that any incident would be investigated, but the way it's reported right now, Dad is justified in shooting the perp. Perp continued choking the girl, even after he was hit on the head by the weapon and shot in the leg. Only then did he approach Dad with a large rock. It took one more round to take him down.