Updated

Baylor scored 21 straight points after Robert Griffin III was knocked out of the game.

Turns out, the Bears only needed their Heisman Trophy hopeful for a half to beat Texas Tech for the first time in 16 years.

Griffin accounted for three touchdowns before leaving with a head injury and Terrance Ganaway rushed for 246 yards and two scores, leading No. 21 Baylor to a 66-42 victory over the Red Raiders on Saturday night.

Backup quarterback Nick Florence threw two long touchdown passes and Joe Williams returned an interception 90 yards for a score in the first 12 1/2 minutes of the second half, pushing Baylor's lead to 52-28.

The outburst came after Griffin, sliding feet-first near the right sideline at the end of a run, took a shoulder to the head from Texas Tech's Cornelius Douglas, who was whistled for a personal foul.

Griffin laid near-motionless on his back, but Baylor initially breathed a sigh of relief when he walked to the sideline, then came in after a missing a play and scored on a three-yard run.

But Griffin spent the second half on the sideline, still dressed in his uniform but with a towel draped around his neck and no helmet. He passed for 106 yards and a touchdown in the first half with 14 runs for 62 yards and a pair of scores.

Baylor (8-3, 5-3 Big 12) won its fourth straight, including last week's thriller over Oklahoma on Griffin's long touchdown pass in the final seconds.

The Bears, who play Texas next week, won five Big 12 games for the first time in program history and earned their first win over Texas Tech (5-7, 2-7) since 1995. It was Baylor's first four-game winning streak since a five-gamer in 1991.