What if Rice or Pierce fumbled? I know they (or at least Rice) rarely fumbles but it could've happen. Taking a knee all you have to do is secure the QB Center exchange. On running plays there's the exchange, the hand off and the RB has to secure it. Plus they wanted the ball centered in the field. And are backs love to bounce it outside. They could've lost just as many yards on three runs as three kneel downs, if not more.