The wingman is a pilot of another plane whose job is to cover his or her lead’s six o’clock—behind him—in an attack
Put another way, the lead is able to focus on the clear threat BECAUSE the wingman is covering the area outside his peripheral vision; covering his back.
This, gentlemen, is the reason you want to park your dang ego and help your partner be competent with firearms. If you are any good at all, you should work at coaching. If that is not a good, natural fit for you, for goodness sakes, recognize that and bring in someone who is.
My WingWife has similar competency to her lead man.