The limp was gone as the 38-year-old engineered a fourth-quarter comeback that kept Pittsburgh as the NFL's only unbeaten team. Those are the four games Dallas has been without star Dak Prescott, out for the season with a broken ankle. Roethlisberger's first touchdown came after he injured his left knee after a throw on a hit from defensive tackle Neville Gallimore. “Someone hit me right on the side of the knee, kind of bent my knee a little bit,” Roethlisberger said. “Just had some discomfort.”Gilbert's first touchdown pass was a 20-yarder to Lamb for a 10-0 lead in the second quarter.