Too late for what? What do you think will happen if a shirtless man on a porch a pulls a pistol, while you have your high powered rifle's scope locked on thei

Too late for what? What do you think will happen if a shirtless man on a porch a pulls a pistol, while you have your high powered rifle's scope locked on their chest while you are wearing body armor, positioned behind a police car, a few hundred feet away?