It sounds like the Deputy was pretty well incapacitated. I don't carry a 9mm, but any caliber is fine i with good shot placement and multiple hits. One of my best friends was shot 7 times with a 9mm and was able to run away from the BG. He was just very, very, lucky that nothing vitally important was hit and that he reached an ER with lots of experience in gunshot wounds quickly. (Charity Hospital in New Orleans) Someone else shot in the same incident by the same gun was shot once in the chest and died.
Shoot some cantaloupes with your 9mm, you'll feel better about it.