Synchronicity
 

Homer: The Turning Rate of the Pivot Components especially the Shoulder Turn as actuated by Hip Action (7-15) - MUST be identical and synchronous with the #3 Accumulator Roll, else its Rhythm gets disrupted.

Tomasello: In other words he is telling you your left Hip has got to be synchronized with this Right Arm. The Left Hip is synchronized with the Right Arm because it is Hips which are going to pull the Shoulder - and the Right Arm goes right down the line.

Ok, so what you are saying is that the hip bump/slight forward step leads to the shoulders rotating towards the target and the extension of the trail arm focussed in pp# 3 to the ball with full extension through the ball.