Arch Manning collected his first career touchdowns in the season opener against Colorado State, but on Saturday he had to step in for starter Quinn Ewers unexpectedly. And, boy, did he deliver. In fact, Manning did something incredibly impressive in his performance. In smoking the entire UTSA defense with a 67-yard touchdown run, Manning actually hit a top speed of 20.7 miles per hour, according to Reel Analytics. CLICK HERE to go to PrizePicks and use code ON3 to receive a guaranteed $50 once you play $5 in lineups! That’s lightning fast for a quarterback. Though his performance Saturday came…