The choreography of Taysom Hill's undoing looks no different than the thousands of times he's run this play before. There's 230 pounds of muscly mass, ball in hand, dropping back to pass. There's a decision: to run instead. And then there's acceleration, the quarterback's considerable frame lunging forward. On the first step, his right foot plants. But something—Hill's cleat, Nebraska's turf, the angle, a twitch—goes wrong. It's impossible to pinpoint. What's different is the sound.
Pop.
To Hill, the sound echoed louder than the roar of the crowd of nearly 90,000 in Lincoln on Sept.