The 49ers trailed 10-6 at halftime. Only 7:46 into the second half, the 49ers lead 20-10. It has been a quick turn of events. San Francisco opened the second half with a five-play, 60-yard drive, with George Kittle’s 43-yard catch-and-run to the Dallas 4 setting up Isaac Guerendo’s first career touchdown on the next snap.