"That was a good old-fashioned butt-whipping," Johnson said. "They beat us every which way but loose."
Baylor knocked off TCU 51-40 in a defensive struggle on Jan. 12. The Bears, however, jumped on the Horned Frogs early and never trailed in this one.
Jackson hit a 3-pointer to give Baylor a 7-0 lead.
TCU missed its first six shots and turned the ball over twice before scoring just more than 5 minutes into the game on McKinney's 3-point play.
The Bears led 23-15 before going on its game-breaking spurt, which started when Brady Heslip found Austin for a dunk. Gary Franklin hit a 3-pointer and Jackson had a layup to push Baylor's lead to 30-15.
Jackson started a fast break and shoveled a pass in the lane to a streaking Austin, who finished the play with an emphatic dunk while he was fouled.
Before Austin could complete the 3-point play, Jackson hit a pair of free throws after Johnson was called for a technical for arguing with officials. Austin completed the three-point play to cap the run and make it 41-17 with 3:35 left in the first half.
"Isaiah did a great job of sprinting down the court," Jackson said. "I just gave it to him and they couldn't do anything but foul him."
Baylor, playing its first game in Fort Worth since 2001, has won 16 straight against in-state opponents.
The Horned Frogs went on a 9-2 to end the first half to get within 43-26 at halftime. The Bears led by as much as 29 in the second half.
Baylor's Rico Gathers had 15 points and 10 rebounds, and Franklin scored 12 points off the bench.