Randy Harrison "suffered a broken forearm on the final play of the first half against Purdue last season [2nd game of season], sidelining him for the year and gaining an extra year of eligibility. Had made 26 tackles up to that point, including 17 against National Champion Pitt"
He was listed as a three time letter winner going into 1976, and three time going into 1977, so he must have lettered in that game and half in 1976.
Just found a story on him. If he had played in second half of Purdue, probably would not have qualified for medical redshirt.