Let's see - the guy chased him down to the police station. Nearly slammed his SUV into his vehicle and blocked off exit route. Then he leaves his vehicle and rushes the shooter.
Frankly if I were in his situation I'd be fearing for my life or at very least fearing serious bodily injury. That warrants drawing and shooting. Anything less and you're risking your life on a chance he won't pummel you to death or cause serious brain injury and make you a vegetable for the rest of your life.
This is who we are, what we do.