Julia Mancuso is shown here in the slalom portion of the super combined alpine skiing event of the 2014 Sochi Olympics. The American Skier went on to win a bronze medal in the event.
From a body language perspective, note how her jaw is protruding forward. This is termed a "Jaw Jut" and is a very common manifestation of a elevated adrenaline state. This nonverbal is of course no surprise here - within the context of World-class athletic competition. Yet in the everyday world a jaw jut very commonly accompanies another emotional state - that of extreme anger. In fact when this body language is seen - there is a high likelihood that the hands will be configured in fists as well as a dramatically increased chance that the anger will quickly escalate to violence. This tendency is particularly true in men.
Thus when you see a jaw jut it is a warning of a possible/probable pending attack. Take heed of this valuable threat assessment sign and move away. Seconds count.
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What body language displays do you see in the video below?