IMHO, intimdation works because of the internal negative fantasy we create in response to them. Whether its size, tone, volume, nonverbal cues, etc. etc., their purpose is to instill fear/intimidation through controling the mind. It may be wise to take these cues in consideration that they other person may attack, but lose the catastrophic fanatsy about what they may mean, and act accordingly. Many people are simply not prepared for the reality of what is possible.