Looking at the video it’s not so easy to tell, even with pausing. What would be the applicable rules?
His knee was down, with the ball in his hand. End of play, end of game.
"The list of errors the ACC acknowledged:
* Replay official Andrew Panucci should have ruled Miami back Mark Walton was down before releasing the ball on one of the laterals. If the proper call had been made, the game would have ended in a Duke victory."