If there are experts here on the topic, I'm certainly not one of them, but when you shut your door after hearing someone come in, you need to make SURE it isn't someone you know (meaning a "friendly"). If you just start blazing away, it would be tragic to open the door and find a drunken, dying family member or friend on the floor. Drunken people forget to knock sometimes.
Massad Ayoob's book mentions that very thing, and it's a biggie.
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