As someone watching Mccasland in that timeout, I can assure you he was not telling his guys to smile.
That said, lets go. Its game 3. You're at Texas Tech. You're down an AA and another starter. Place is on fire. Welcome to big time basketball, time to learn - we don't need to demand Brad make kids smile everytime the other team goes on a 4-0 run.
I could easily make the case those dudes playing through it in the first half, prepped them to be much calmer and collected in the second half. And will do far more good for them in the long run.