It is a common trick to talk your way into a driving lane or through a waiting line. they start explaining as they move and as the other is processing and waiting out of habitual politeness, he loses his spot, turn and initiative. On the road it is not fetal but in attackers where people approach you as they talk one way and do another most will go for the least amount of social tension and out of fear to look like a jerk or hostile they will loose their lives or worse their families. Think what feels right inside of you when you take out the trash or see a person smiling a salesman smile as they slide into a position you know is not good for you and choose to act to survive.
To protect yourself, your family, your country and fellow men.