This is a phrase that we have heard in many films, all with a common denominator: an experienced shooter said. And with this we do not mean snipers with Barrets, because although it is true that the said Bradley Cooper in American Sniper also said Mel Gibson in The Patriot.
It is based on a premise that explained Mel Gibson to their children in the film, everything we asked of them was that they were pointing to the buttons on the jackets, knew that if they failed it would not be much, but this way ensured achieve the objective.
This is something that could also apply to airsoft way preventing us from escaping our crosshairs many adversaries. But unfortunately this would not solve all fails we can find in the airsoft.