"When I was the head coach, I didn't enjoy the lack of interaction with the actual football part of it," Pettine said. "I always made the comparison, it was going from being the teacher to now you're the principal. . And I didn't like it. I missed the camaraderie of the room, the interaction with the staff, the interaction with the players. The chess-game part of it - the designing a game plan tailored to your opponent."