Where did you read that, SavvySwede? Certainly can place feet in water/sand hazard and play ball not in hazard. Sounds like you are saying 'cannot have any part of body, when playing shot, not in-bounds'. Is that correct?
Can my hands extend away from in-bounds body into OB country and me be legal? If not, then OB extends upwards, not only on ground. What about the club itself extending into OB, then back again into in-bounds?