When it says behind the guards does that mean a ref is going to call an illegal formation if the backs are behind the guards but, not in a direct line behind the guards or is it just that they need to be behind the guards and not behind the tackles? Not trying to be difficult but, I think that is the extent we are talking about. It would be obvious if the backs were lined up behind the tackles but, if we are talking a few inches one way or the other I would like to be sure.