Penn State Sunday rewind: Why did the Lions go for it on 4th and 1 at their own 19, and what went wrong?

Penn State football beat SMU. But, a key sequence could have changed the game after a failed 4th and 1 at the Lions' own 19.
Penn State football beat SMU. But, a key sequence could have changed the game after a failed 4th and 1 at the Lions' own 19.