Another point I'd like to make to all the keyboard commandos here too is a "lesson learned" from this critical incident is to fire a few rounds at a CQB distance or be able to safely operate your weapon at extremely close ranges.
My security instructor;
www.S2Institute.com , made those points & when I can I shoot a few handgun rounds at a paper target or 2 at arm's length or 3-5'. It's not pretty but it may keep you alive.