One of the most elementary self-defense concepts is that you don't leave your back to a door, the classic US example being Wild Bill Hickok: https://en.wikipedi

One of the most elementary self-defense concepts is that you don't leave your back to a door, the classic US example being Wild Bill Hickok: https://en.wikipedia.org/wiki/Wild_Bill_Hickok#Death_at_Deadwood https://en.wikipedia.org/wiki/Wild_Bill_Hickok#Death_at_Dead... I personally want everyone behind me to be known, with entries where strangers can come from somewhere in my direct or peripheral vision range. Or a loud enough door that I can hear someone opening it.