Thanks for the link, good-to-know info for sure.
It strikes me that this scenario was a shit sandwich no matter how it was sliced. Short of "seeing it coming" there were IMO no options that stood out as definitively better. It was a fast ambush of three against one, with few options for response. Even being armed and proficient with the weapon was no guarantee of a better outcome. It could be that the way it ended was the best to be hoped for, though it still sucked to be victimized that way.
I can relate to this one because long ago I spent many years in the trades working in people's homes. My work required many trips out to the truck, with my mind fully engaged with the task at hand and as a result, mostly oblivious to my surroundings.