"Why wasn't it called?"
Maybe ... human error? Again, go back and look at the first half of that game if you have a chance and see some of the ticky-tack fouls called on Jeff Withey. Why WERE they called? He only played nine minutes in that entire game. Why? Think his extended presence might have not made the contest as close as it was at the end of regulation?
Why did Michael Dixon and Kimmie English jack up and miss numerous NBA threes just a few seconds into the shot clock after you had built that 19 point lead, which helped immeasurably in our come-back? Why?
Look at the box score of the game played in Columbia earlier that same season your boys won 74-71.
https://www.espn.com/mens-college-basketball/boxscore?gameId=320350142
You shot 20 free throws in that game to our nine. Why? Did the referees 'swallow their whistles' THEN? Is that why YOU won we lost?
Why do referees calls in KU games always favor us?