I would never chase anyone, but the last time I surprised someone peeping into a car I was running back out to the car because I forgot a tool in it, believe me both of us were very surprised, I hit the brakes and the guy gave me a surprised look

and then took off running. Yes you are right, we are told at CC to not chase anyone. I would never "confront" anyone stealing a system, the only thing I would ever do is yell at them from a safe distance away just to scare them off.