A lot of times in this game, players learn the hard way. Quarterbacks often get injured when they leave the pocket and try to pick up yards on the ground. There are a lot of examples of how dangerous that is -- Robert Griffin III is a cautionary tale.
That's a lesson Derek Carr just learned the easy way. He scrambled to try and pick up the first down in the team's game against the Bengals last Sunday and at the end attempted to lay a stiff arm on Bengals cornerback, Adam Jones, using his throwing arm.