Recognize warning signs of aggression and potential violence
There are some obvious signs of aggression and potential violence, such as reddening of the face, threatening gestures and so on. However, it is important to realize that there are many other, more subtle clues that can alert us to the potential for aggression and violence. In situations where we anticipate someone may become aggressive (where we have to deny their request, for example), we need to be using our nonverbal communication skills and watching carefully for signs that tension is growing. There is often an escalation. For example, it may start with something quite minor and normally imperceptible (drumming of fingers, moving about uneasily in their seat and so on). There are things we can do to minimize the chances of aggression and violence (effective listening, for example), but ultimately, if you feel you are in real danger of being assaulted it is wise to leave the situation at the earliest opportunity – for your own protection and also for their protection, as having a criminal assault charge against them is likely only to make their situation worse.