The laws say the referee should call "use it" when the ball is at the number 8's feet, but since the beginning of this season the laws have also said that the 8 can pick the ball up if he can reach it (though admittedly that's how it has been refereed for years.)
So - can the referee call "use it" if the ball stays resolutely at the second rows' feet?
So - can the referee call "use it" if the ball stays resolutely at the second rows' feet?