Try it." Steve did try it, but he could only shuffle an inch or two.
"See ?" asked Marvin.

"Now, then, having tackled you, it's up to me to put you down.

If I let you come forward of your own impetus you'll fall toward my goal, and by stretching out your arms you'll put the ball two yards nearer the goal than where you stand.

Of course you wouldn't risk holding the ball at arms' length unless there was a possibility of getting it across a goal-line by doing it.

But even if you hold the ball at your stomach you'll gain a yard by falling forward.