if he had it tucked, it should have been a fumble. they said his arm was still moving forward, which is why they said no fumble. it looked tucked to me.
NFL Rule 3, Section 21, Article 2, Note 2: "When a Team A player is holding the ball to pass it forward, any intentional forward movement of his hand starts a forward pass, even if the player loses possession of the ball as he is attempting to tuck it back toward his body. Also, if the player has tucked the ball into his body and then loses possession, it is a fumble."