Indianapolis Colts middle linebacker Anthony Walker (54) celebrates with teammates after he recovered a fumble by Houston Texans quarterback Deshaun Watson during the second half of an NFL football game Sunday, Dec. 6, 2020, in Houston. (AP Photo/Eric Christian Smith)HOUSTON – With their offense sputtering in the second half Sunday, the Indianapolis Colts turned to their defense to seal a win over the Houston Texans. Philip Rivers threw two touchdown passes in the first half and the defense dominated after that, lifting the Colts to the 26-20 victory. Their offense didn't score after that, but the defense held Houston (4-8) scoreless in the second half and Justin Houston added a safety with a sack of Watson in the end zone. With Sunday's shutout in the second half, the Colts are allowing an average of 7.33 points in the second half of games this season.