Not sure it applies here, but nothing calms the nerves better than using a rifle that has been fired so often, the shooter need not even think about how theyre working it. And likewise, trying to load and work with a rifle that's new or seldom used only makes the mind even more nervous in clutch situations.
Simply put, when you see cross hairs on a target often, they bring your mind to ease. See them rarely, and the mind usually does just the opposite.
As for seeing him again, they never get old being stupid.