Originally Posted by WildVolley
Yes, I see what you are talking about. But Jeff actually has the racket face pronate through the ball and away from his body, just as the other guy does, but when he then lets the racket drop, he turns the face back toward his body.
Watch it again. The motions in the two videos are basically the same until the very last part when the server is relaxing.
In this particular video for the kick serve I am not focusing on pronating even if it happens naturally. I have found the key is the finish and everything happens naturally before that. If it does not, then make adjustments. Get the stings facing you at the end of the swing, if you want to develop feel and control on the kick serve.