The fair catch rule used to be simple - just raise your hand above your head. It was changed because players were raising their hands above their head to shield their eyes, or to actually catch the ball. It was decided that waving more than once was a clear signal. To make sure their was no confusion, an illegal signal was defined so the kicking team wouldn't be penalized for not hitting a returner who was signaling improperly. Illegal fair catch signals apparently happen but aren't always called. Sometimes they are called, and sometimes they are called when they shouldn't be called.That is the purpose of the fair catch rule. What is the purpose of invalid fair catch rule?
Iowa still could have won the game by gaining 20-25 yards and kicking a field goal with just under 2 minutes left. While that's not necessarily an easy task, it's also not a next to impossible task either.