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Absent an articulable observed threat to me or my family I still wold not open fire. But my circumstances might be different than many/most. My house is rather small (1600 sq ft) and it has a very open floor plan. except for a tiny hall betheen the 2nd bath and two auxiliary bedrooms, it has no hallway. One side is a bath and 2 bedrooms with a miniscule hall, the other side is the master suite with a fair sided open area in between. The middle of the house is 1 contiguous space with a 40' sight line. Living room, dining room and kitchen are set apart by architectural features but at the ceiling there is nothing. When I hear noises at night I immediately pull my baby eagle out of its little hammock beside my bed and go to investigate.
It I caught the intruder in either the 2nd or 3rd bedrooms, 2nd bath or the connecting hall there would literally be no place to which he/she could flee. If I perceived a weapon being brought to bear I would open fire. No, cassandrasdaddy, I have never fired a firearm in anger (hope like hell if I fire it for home defense it STILL won't be in anger) but I have pulled the plug on my baby brother whom I diapered, advised my Mother she was terminal and filled out a blank, signed DNR order within 48 hours. 3 days after THAT I pulled the nasal cannula out of my dead Mother's nose and drove home with what was left of my baby brother sitting in a baggie in a box in the floorboard behind my seat. I reckon that if I can do that in a single 5 day period, I can freaking well open fire on an intruder. If I caught the intruder coming into my bedroom I would open fire - and the fact that he was coming into my bedroom would be ample evidence of intent for the civil jury.
But if I caught him/her out in the open area in the middle of my house and he/she was heading for either of the doors, that would be pretty good evidence that the intruder was, indeed, fleeing. HOWEVER If, prior to opening either door the intruder stopped and even started to turn around (unless it was in response to my command to stop) I would open fire and continue to discharge the weapon until I perceived them to be stopped. Whether that meant I fired until slidelock or just a few rounds would have to be seen.
I will do whatever is necessary to take care of my family. I would probably feel like CRUD afterwards - I STILL beat myself up occasionally about "killing" my brother and Mother after 4 years - but I would not hesitate during the crisis. It's just how I'm wired.
But I think Garner and the "Fleeing Felon" rule are the best course, Bill_rights, even for private citizens. Even assuming that Texas' castle law would protect me from the DA, I could easily wind up having to prove by preponderance of the evidence that I considered the intruder an imminent threat to someone's life when I shot him/her in the back.
Cyborg