just don't open the door.
if someone or something seems odd then it probably is odd.
odd isn't ALWAYS threatening but still just leave door closed.
take position to call authorities and cover door.
if intruder (girl, boy, man, grandma) kicks the door in, then they will
surely see the barrel of the 20 gauge and decide accordingly.
Hopefully they will leave.
If they stay then it is for potentially harmful reasons.
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