Umpire Marais Erasmus forgets to position himself for a legal delivery

Senior umpire Marais Erasmus forgot to watch a legal delivery in the first ODI between England and South Africa in Mangaung Oval, Bloemfontein. As Jason Roy plays a cut off the backfoot, Erasmus is seen standing at square leg with his back towards the batter. When he hears the crack of leather on willow, the veteran is suddeny hit by the reality of the situation. He moves his neck around to see what transpired but the ball has already been played by that point. It was a rare faux pas by a member of the Emirates ICC Elite Panel of Umpires.