Delayed shoulder turn.
What seems to work for me is to start my downswing with my arms and resisting any turning of the shoulders back to ball and they ultimatelly return as a result of a very aggressive arm swing. I feel like I can not get to the ball but the next thing I know the ball is gone going straight and extra long for me. Its sort of like trying everything like not try to the ball except the arms. I finsh completlly roated and I do not have my head dramtically past the ball which is a bit eroor which sends my ball right. I guess this fits the statement turn drop turn only the 2nd turn is passive.
Dave