The ideas that would one day inspire a football revolution had been rattling around in Hal Mumme’s head for a few years before he finally had the chance to use them. It was 1986, and Mumme had just lost his job as Texas El Paso’s offensive coordinator. With nowhere to turn at the college level, Mumme retreated to the ranks of Texas high school football, where he inherited a struggling program with just a handful of wins during the previous decade. Out of that desperation, the Air Raid’s roots first took hold in the central Texas soil, where three-yards-and-a-cloud-of-dust was long the offensive doctrine of choice. Mumme didn’t have that…