That is sad.
3) Had the boy been armed with a 5-shot snubbie, he would likely not have had enough rounds to deal with the apparent number of BG's.
A 13+1 XD45acp loaded with the latest whiz-bang personal defense rounds wouldn't have done much to guarantee his survival.
I don't care what you're armed with. If you wander into a room where evil people are set to do you harm you're probably toast. Even trained officers don't make a habit of clearing houses alone. One person acting alone has a much better chance of survival if they try to not make it an offensive situation.