These next two videos illustrate the same problem. In both cases, the targets do not want to fight the aggressors. The aggressors are not deterred by the targets unwillingness to fight, they are in fact encouraged by it. The result is violence.
The problem is that the targets do not execute a strategy of progressively escalating responses designed to deter aggression. Therefore, the end result is an unwanted fight.
Here passive body language and lack of strong verbal deterrence precedes the fight.
In this second example, the target attempts to talk his way out of the impending fight.
Effective use of the Progressive Fence by both of the targets in the above videos may have de-escalated the situations and avoided the fights.