I always thought it was whether your pulling or pushing, then ideally you want the right forearm in the right position to support that load.
Pushing or pulling is physics... these are Homer Kelley's words ( as per 7th edition and editing)... my italics /bold/underline....
"HIT OR SWING
7-19. LAG LOADING
This category recognizes the over-all control by the Clubhead Lag Pressure Point (6-C-2) and that manipulation of its Loading Procedure determines the Physics of both Hitting and Swinging (Preface). (Study 6-H-0, 7-3 and 7-20.)"
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