I'd follow him to his house, then 2 days later when he least expects it, I'll knock on the door and when he opens the door, I'll shoot him in the knees. I'll look at him and say, "If you pull out a gun, you better use if." Then let him bleed to death.
A guy is going around your neighborhood and stabbing people regardless of age, gender, or sex. You find out who the guy is, what do you do?