Here are three scenarios, one much more likely than the other two. The SEC's had a predicament like this before.
In 1972, Alabama led Auburn by 16 points with 10 minutes left. Auburn kicked a field goal, then blocked a punt and returned it 25 yards for a score. Alabama was later forced to punt again, and Auburn blocked another one and returned it for a score. David Langner scored both touchdowns, then sealed the game with an interception.