I too saw that "crazed" look with Day urging the team on despite the huge lead. Towards the end of the first half, he was actually running after the referee to get a timeout so that the Buckeyes had enough time for just one more score before the half.
I love Day's demeanor on the sideline, the way in which he calls immediate timeouts to adjust to the unexpected (for example, I-formation), and the way he lets the best players play regardless of seniority. The biggest difference is the way he handled the defensive coaching staff and decimated the former "defensive" staff. The results are wondrously awesome ! He makes the tough decisions and implements quickly!