[Par71]

but in 2-G Hinge Motion, HK says that ““Roll” is actually imparted by the turning torso and/or the orbiting Arms per 2-K#4 and 2-K#5 as described in 10-18”.

Well, what is he talking about?

Do you Turn and Roll or Not???
Is Turning and Rolling done by the Torso and orbiting arms?
Is Homer mixing terms?

For the 7th edition, in that sentence from 2-G, "Roll" was changed to "it" (Hinging):

The Physics of Hinging is that, Hitting or Swinging, it is actually imparted by the turning torso and/or the orbiting arms

Hinge MOTIONS (geometry) describe the Clubface Motions through Impact (closing only, layback only, closing and layback), 2-G.

Hinge ACTIONS (physics) describe and control Hand Manipulations to control these Clubface Motions, 7-10. At Low Point, the Left Wrist is Vertical to all three Basic Planes (Horizontal, Angled, Vertical). Hinge Action holds the Left Wrist Vertical to one of these three Basic Planes. This Action is imparted (conveyed) by the turning torso and/or the orbiting arms.

Rotational Wrist Conditions (4-C) are defined on the basis of the Hinge Action being used. Vertical (4-C-1) means that the Left Wrist is vertical to the Basic Plane used by the selected Hinge Action (the Horizontal Plane for Horizontal Hinging, the Angled Plane for Angled Hinging, or the Vertical Plane for Vertical Hinging). Accordingly, Turned (4-C-2) means turned towards that Basic Plane, Rolled (4-C-3) means rolled towards that Basic Plane.

But the Clubface Motion is always viewed against the background of the Plane Line. Holding the Left Wrist Vertical to the Horizontal Plane makes the Clubface appear to close (visually) in relation to the Plane Line. This gives the (optical) Appearance (7-10) of a Full Roll.

And the Club always moves on an Inclined (Angled) Plane. Holding the Left Wrist Vertical to the Horizontal Plane (Horizontal Hinging) makes the Left Wrist "roll" in relation to the Inclined (Angled) Plane ("roll" is put in quotes here because, technically, the Angled Plane is not the Plane that the definitions in 4-C would refer to for a Horizontal Hinging procedure). This creates the Feel (7-10) of a "Roll".

Holding the Left Wrist Vertical to the Angled Plane makes the Clubface appear to close (visually) in relation to the Plane Line, but less than with Horizontal Hinging; this gives Angled Hinging the (optical) Appearance (7-10) of a Half Roll. Holding the Left Wrist Vertical to the Angled Plane makes the Left Wrist remain Vertical to the Plane on which the Club moves and, therefore, creates the Feel (7-10) of a "No Roll".

Holding the Left Wrist Vertical to the Vertical Plane makes the Clubface appear to not close (visually) in relation to the Plane Line; this gives the (optical) Appearance (7-10) of a No Roll. Holding the Left Wrist Vertical to the Vertical Plane makes the Left Wrist "turn" in relation to the Inclined (Angled) Plane; this creates the Feel (7-10) of a "Reverse Roll".

In the 5th edition, in 4-C-3, HK said

"ROLLING" refers to either or both, the "SWIVEL" (if any) of the "RELEASE ROLL" into and/or out of the Impact Interval AND the Vertical "Wrist Roll" of the Hinge Action (2-G) during the Impact Interval. So discrimination is essential to avoid confusion.

In the 7th edition, in the last paragraph of 4-0, HK said that when the Vertical Wrist is moving to the left during the downstroke,

it is ROLLING - closing to the flight line - but is not ROLLED.