We'd dominated them all night, but had they punched in a touchdown there, it would have been 21-7 with more than 10 minutes left to play. A 3-and-out right after would have put some pressure on us and put an uncomfortable feel to the situation.
It's doubtful we'd have blown the game, but it probably would have turned into one of those 27-17 kind of wins that are nice to have but don't stir the confidence up that a real blowout does.