That is what made it confusing for me. Obv it's clear that his arm was moving forward, but the ball never left his hand, which is what made me think that maybe it could be an exception to the rule and be ruled as a fumble.
That being said, I don't believe there is anything in the rulebook that differentiates between a passer's arm moving forward with or without the ball having left their hand. Because of that, I was not surprised for the play to be ruled an incomplete pass. If they did rule it a fumble, there would have been insane backlash over the call bc the arm was CLEARLY moving forward and it seemingly doesnt matter that the ball never left Hill's inept hand...
BUT i still think it was a fumble lol