What Manziel has is an instinctive vision, Tarkenton said. He did it against the toughest level of college football, twice the last two years against Nick Saban's Alabama defense. Tarkenton proved extremely durable until he missed five games with a broken leg in 1977, his next-to-last season. Manziel is not going to be able to run as much at the next level, Tarkenton said. They had called running plays for him in college.