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WATCH: Oklahoma's Tre Brown flies in for game-changing safety vs. Texas in Big 12 Championship

ARLINGTON -- Just when it looked like Oklahoma was losing momentum and its grasp on a fourth straight Big 12 championship, Tre Brown made a huge play.

The Sooners had just ended up on the wrong end of a CeeDee Lamb fumble. Texas quarterback Sam Ehlinger dropped back to pass but never saw the corner blitz coming from Brown. It resulted in a safety, and yet another momentum turn in the Red River rematch.

Here's the play:

That play extended OU's lead to 32-27 and gave the nation's best offense a chance to make it a two-score game in the final minutes.