Received an email this morning with another video which looks to have another angle and was shot from the Marriott Center.  The angle shows the opposite view of the previous video and is in real time.  Looks like it was a closed fist back hand punch and it looks like Marshall Henderson swung when the ref turned his head.

I assume some type of suspension will come of this, I believe there is a minimum of one game for a closed fist altercation.  It will be interesting when BYU fans come to the Huntsman center in a few weeks, and that he will be in the Marriott Center three more times.