Chun-Li: My father saved his village at the cost of his own life. You had him shot as you ran away! A hero at a thousand paces.A critical event that started the protagonist on their journey was an action by another, an action they may have long since forgotten, most likely never giving it a second thought. This is used to show that the action, however exceptional it may seem to the protagonist, is mundane for the antagonist. For them, it was just another day.
M. Bison: I'm sorry. I don't remember any of it.
Chun-Li: You don't remember?!
M. Bison: For you, the day Bison graced your village was the most important day of your life. But for me, it was Tuesday.