what is meant by this?
 

"But all players must Swivel -- actually rotate their Wrists -- into the "parallel to the Plane" position for the Finish after the Followthrough." (4-D-0)

could someone explain this to me in detail please?

(this websit has been a life safer for me but i am still learning, please be patient with me.)

there is a vid in the gallery
 

that will answer your questions on this