This is from the official FIFA 2017 Laws which you can find at
http://pressbox.mlssoccer.com/sites/default/files/Laws_of_the_Game_2016_2017_Neutral.pdf
Handling the ball involves a deliberate act of a player making contact with the ball with the hand or arm.
Handling the ball
The following must be considered:
• the movement of the hand towards the ball (not the ball towards the hand)
• the distance between the opponent and the ball (unexpected ball)
• the position of the hand does not necessarily mean that there is an infringement
• touching the ball with an object held in the hand (clothing, shinguard, etc.)
is an infringement
There was NO deliberate act to make contact with the ball with his hand
Movement of hand was NOT really towards the ball even though it was in the air
Position of the hand is irrelevant as Pog was so lost at the time he was in a ballet "spin"
So there is a reasonable argument the penalty was a poor if not incorrect call but one most refs in the heat of the moment are going to call