For forehand, it is generally preached that the racket face be closed at the beginning of forward swing because forward swing causes the racket face to open up a bit. Is the same true of 1HBH drive? When I try shadow swing, my forearm tends to supinate during upward, forward swing of both forehand and 1HBH. But forearm supination during backhand would cause the racket face to close even further, while forearm supination during forehand would cause the racket face to open up. If so, shouldn't close racket face at the beginning of forward swing in 1HBH cause the racket face to close too much?