He’s trying to teach this boy something about life, about survival. A survivor has a set of rules to live by, to help him make the right choices.
This boy here has been making some very bad choices. Choices like doing wrong by his daughter, leaving her to flee across state lines. Good thing he caught him. The boy won’t be running away from the consequences this time.
This time, the boy gets to make the right choice: die a painful death, or live life without the only part of him that loved his daughter.