For those expecting Manziel's prolific rushing exploits to translate into a blazing 40-yard dash like the 4.41 that Robert Griffin III turned in when he participated in the combine in 2012, Manziel's time might not be too impressive. But it's Manziel's quickness and change-of-direction skills that make him such a dangerous runner, and the time he ran showed more than enough speed for NFL scouts to know he can be plenty dangerous on the run in the NFL.