If you were a cop, how would you respond to this incident?

I thought the cop handled the situation perfectly.

I also think carrying a 9mm opens a lot of opportunity to get shot even after hitting your target.

I wouldn't carry less than a .40mm with hollow points. A whole lot more power without sacrificing much in the way of capacity and without a huge increase in size or weight.

The reality is that handguns just aren't as powerful as Hollywood and the media would like us to believe. Even the people claiming a .45 delivers instant stopping power are wrong. Shot placement is much more important than power and this officer proved exactly why that is. However, a .40 hollow point has almsot twice the impact and destructive force power of a 9mm and it certainly doesn't hurt the cause. In this case, a direct hit to the chest and this would have been over a whole lot quicker.

As for the officer, it is so near perfect it'll probably be used in training for a very long time.