Yes, the Big 10 crew blew this one. If you watch the replay of the spike, not only did UNC sub in one OL for the snap, but the HOLDER AND KICKER ARE BOTH IN PLACE. Per the rules, the defensive team is allowed to also substitute players under that condition (while the referee stands over the ball, clock running.) If I knew how to post video, I'd post it. Granted, this was a glorofied scrimmage, but it was an utter clusterhump there at the end.