Glenn Dee, you make a good point. Just about everyone who has trained in house-clearing (and found out how difficult and dangerous it is--even for a team) counsel against going after an intruder. Stay in one room, armed of course and on the phone and let the pros clear the house. The only reason to leave your defensive position would be to gather kids or other dependents back to the position*. This puts the intruder at the disadvantage of moving through an unfamiliar building.
*This argues for a house design that groups all the bedrooms near each other; on the same hall and/or floor if possible.
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