It is often what you do not see that hurts the most in a violent conflict. The following video shows a ton of sucker punches or strikes that the other person did not see. Most of this is real world violence and as a martial practitioner you need to understand that no one and I mean no one gets into your personal space unless they are a family member or friend. That space is sacred!!!
This video is NSFW as there is quite a bit of swearing and it starts out weird with a card trick they are trying to sell but on the whole the video illustrates the point of maintaining your personal space:
Also unfortunately there are a bunch of these types of people in the world. Best advice I can give is stay away from tools. 😉