That potential PI call in the end zone is called maybe half of the time, if that. Officials were obstructed and two guys were battling each other.
Not only was Illinois State screwed out of 7 points, but they also had to start their next drive on the 2 yard line thanks to a nice punt. In a defensive battle, 7 points taken off the board and flipping field position to the 2 yard line, was the difference in the game.