Ayoob on Firearms - worth a look

Massad Ayoob is one of my favorite authors. He has been a sworn police officer for more than 26 years, serving the last ten as a captain and prosecutor with a municipal department in Northern New Hampshire. He also writes a column for Backwoods Home magazine (An ex- of mine was a subscriber) called Ayoob on Firearms. A recent column, Body Language and Threat Recognition, covers being aware of your environment to be prepared for an attack.

People have been hurt—sometimes by strangers, sometimes by people they knew and loved—when they failed to realize that the other person was experiencing a level of hostility that was about to boil over. Being able to recognize body language associated with imminent violent action can allow you to, in the best-case scenario, disengage and leave the scene. At worst, it can give you time to activate a plan of self-defense soon enough to effectively protect yourself and those for whose safety you are responsible.

He goes on to cover the danger signals that an individual may become hostile. As an experienced police officer, he knows what he is talking about.