I hope people are joking in here and not actually believing you can tell anything from that brief clip. Looks to me like, in the action of the game, he saw the shot go in and tilted his head to start going back down the court. It's a Reed Richards stretch to draw some conclusion by a split second of his facial expression to he's betting on games lol. It's like using a picture where a moment was caught in time to decide that someone felt a way about something (when the possibility is inconclusive).