Some advice please. A player who is on the ground near the corner flag, lifts the ball between his feet and swivels in his backside to move the ball 180 degrees. In the back of my mind I seem to remember that's obstruction but then you can lift the ball with both feet for a free kick. Looking through the lotg I couldn't see this as an offence but I feel it should be. Can anyone point me in the right direction please?