Nowadays he couldn't do that because the offense jumps to the line so the defense can't sub they're calling it the HUNH..lol
And leach teams didn't? Dude just pick your moments. Learn to play more than one play at a time. As soon as an incomplete pass comes or a penalty or a tackle for loss you got your chance. Make a play and their offense slows down enough to do your thing. These guys aren't moving so fast your head is spinning.