1st is another case of a 9mm just not getting it done. 2nd if he would have been hit in the boiler room with a .40 or .45 with good hollow points it would have been game over. I bet the hits were NOT in the boiler room. If some were then that points to #1. A shotgun would have put an end to it in short order with slugs or buckshot.
Colt King Cobra .357 Colt Anaconda .44mag
Springfield Armory .45 Double stack Loaded
XD40 service XD45 Taurus 617 .357mag
Smith M&P 40