Nice flop that got rewarded. Good opportunity for the administering official to do a little preventative officiating to get those two separated and within their own vertical space prior putting the ball in play.

If you pause the video, right around the 8 second mark you can see the defender starting to jerk backwards and the offensive player's arms are still at a 90 degree angle. It also looks possible that the offensive player's arms jerk forward because the defender temporarily grabbed his hands as he threw himself to the ground. It all happens pretty quickly, but looks possible.

And the way the defender pops up clapping was almost his way of saying "I just got one over on you".

Could be. Also could be "I knew they'd get you for that eventually."

If you see what I see at the 8 second mark, it couldn't be that.....

At the present time, the video is no longer available. The original article has an animated gif though.

My point was simply that the look on his face, by itself, means nothing.