Quote ="Charlie Sheen"If it's backwards out of the hands it doesn't matter where it lands.'"
That depends on the initial forward motion of the player. The grey area is that, if the player is running forwards, but passes in a backwards motions, it is still possible for the ball to travel forwards.
In the instance of the try, McGuire is running sideways, so its a clear forward pass. I don't have a physics PHD or anything but I'm sure if you pass the ball forward, then it travels forward??