When Does The Swinger's Hand Manipulation Occur?
 

The 'manipulation' of the Hands Manipulated Swinging Stroke -- the Left Wrist Flat, Level and Vertical at Impact (with the Clubface aligned slightly Open) versus the Club's normal Straightaway Flight point -- occurs when the Grip is taken at Impact Fix and not during the Stroke.

In other words, after the Grip is taken, Centrifugal Force rules.