There is far more to the art of kinesics. One thing is true though, animals give off warnings and invitations. Dogs are especially good at signalling with body language. It really comes down to four items. The first clue is the eyes. Dilated, pinpoint, contact, lack of contact, looking up, around, down or simply wide open staring. A sign of mental disturbance is the lack of blinking. Fixated stares indicate danger. The hands are the one thing to concentrate on. The hands reveal intent, mood, agitation, anxiety, physical tremors and they generally will be the bearer of the weapons or movements inside clothing that will precede a explosive device activation. Watch the hands. Hair and clothing choices are fair indicators. Well manicured and well dressed does not equal well behaved, think Ted Bundy. Look for anything out of the normal routine. A rabbit fur hat in August in Tucson is a good sign something is not normal. Years ago, a mental defective bought a set of Class As and walked around enjoying salutes. He was outed by the first person who noticed his cap device was incorrect. He was convincing otherwise. The final area of note is the set of the attacker. I have seen this and one can actually view the determined gait and predatory manner. The attackers entire demeanor and actions become focused on the single goal. They tune out everything else, begin their circling, head swings, eye movements to check for warning signs and then attack. It is well choreographed and escape routes are usualy preplanned. Smash and grab artists are amazing on video. There is nothing random about their art. Be alert.