If you're playing for Argentina in the World Cup, chances are you're pretty decent and football, even if you play in defence.
But why should the task of not conceding stop you from showing Messi you can play a bit too, why be shackled with the constraints of typical defending protocol? Why can't you play the ball across your backline, hell, why not do it with a rabona, or at least that's what Marcos Rojo was thinking.