The hung over part, I believe.
When the ball comes into view, the receiving player has his feet just outside the 18. When the defending player on the far edge of the screen comes into view, his feet are just INSIDE the 18.
Now, where was he at the moment the ball was touched? Anybody's guess. Not on camera. If he was even with the line where he came into view, he had the receiver barely onsides. If he stepped back when the ball was played, offsides. From this camera view, the world will never know.