imported post
I think you did the right thing, and I'm not sure why you're doubting your actions. As I stated in response to your original post, it's the job of the police to chase criminals, not ours. I question the owner's wisdom of pursuing them. I understand why he would want to give chase, but it is inadvisable. You didn't say if the owner was armed, I assume he was not, which makes it even more foolhardy.
I concur with the others that limiting one's self to just four rounds is ill-advised. Your intentions are fine, but your intentions will not determine the circumstances that you could find yourself in. I would advise people to have a fully loaded firearm and a minimum of one complete reload-- not because you're likely to get into a firefight (you're not) but because magazines are the component of a firearm most prone to crap out on you when you least expect it and least need it. Secondly, criminals, being the cowards they are, frequently prowl in pairs or groups. Four rounds may not be enough to allow you to safely disengage from the threat on your own terms.
Retreating is fine, but it is better, tactically speaking, to do so because you can, not because you're forced to do so by an empty gun. As the old adage says, "better to have it and not need it..."