The oddsmaker must have put too much stock in Texas' 91-86 victory against Oklahoma State to win the Big 12 Conference Tournament because this total is too high.
Prior to that game, the Longhorns hadn't surrendered more than 68 points in any of their past five games. Texas gives up 68.2 points on the season and ranks in the top 50 in defensive field goal percentage. 
Only seven teams allowed fewer points per game than Abilene Christian, which permitted only 60.7 while ranking 24th in defensive field goal percentage. Abilene Christian is in strong defensive form, too, giving up only 59.2 points per game during its last four matchups.