The puck release photos look like throw away. right wrist flatten to early. I think it is helpful to differntiate between pronation and supination of forearm(radius & ulna) and pronation and supination of entire arm. Laying club off is a forearm rotation problem. The answers to your questions are important to the understanding of the proper motion. Hopefully Yoda will give us a final understanding. I understand hinging as an entire arm concept and swivel as a forearm concept. Swivel appears to be tied into forearm bending and straigtening and uncocking left wrist. Swivel puts the hands into a vertical position for impact. I guess vertical to all planes and hinging then refers to motion after impact vertical to the selected plane. Help !