Something I was thinking when watching this live is why does the defender get that space? Clearly the defender is moving his body. He is leaning in, leaning left, leaning right, and possibly even shuffling his feet. In other words he is not set. Given that 90% of the time the defender is not set, why isn't it a blocking foul? I get that it has never been called that way but under the rules, I think it is actually a blocking call not an offensive foul unless the defender is set.
With respect to the call I am not certain what happened. If Nash was acting he did a really good job because he moved very quickly to when the contact "occurred" and had a very realistic flinch. At the same time, I couldn't really see the contact on the video and I couldn't see the non-contact on the video. To me the video was inconclusive.
I think the rule needs to be changed to where a play like that is just a loss of possession. Two shots and the ball is a big turn of events in a close game. The defender should not be allowed to get so into the offensive players space that he cannot even move without drawing contact unless they plan on calling the foul on the defensive player.
People prefer high scoring games so the officials should call the games to encourage point production. As much as I liked Sampson and respected Sutton, I think their style of defense was bad for the Big XII. The old Big 8 days with Tubbs, Hamilton, Norm Stewart, Johnny Orr, etc. were more exciting.