Home defender could have simply done a callout.
As in: "Who the hell is it and what do you want!" Delivered from a more advantageous interior position.
People seem to have an ingrained "need" to open their doors for improved situational awareness. Probably reinforced from a lifetime habit of doing exactly that for minor things. A mindless, conditioned reflex.
A habit to train yourself (and loved ones) out of.
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Figure The Odds...
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