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This variation is generally considered destructive.

 

The low, outward back-knuckle maneuver, both single and double, is varied by executing the strike on a circular path rather than a linear path. This variation is accomplished by altering the path angle for the outward back-knuckle strikes of the isolation (both single [#3b & #4b] and double [#6b]) from being executed on a linear path of travel to one that is more circular in nature. This variation basically comes down to an argument of personal execution choice (stylized) over theme (idealized).

 

Rationale For

The rationale for this variation is to be more natural in execution. In other words, back-knuckles are typically executed on a circular path, therefore it is expected and more inherently normal to execute the back-knuckles in the isolation on circular paths. This can tend to give the form a slightly more natural appearance, from the observer's perspective.

 

Rationale Against

The rationale against this variation is that it deviates from the paths outlined by the themes of the form (circles / lines). Each section of the isolation should demonstrate both circular and linear motion in various ways. And, in this specific sequence, the circular motion is the backward to forward vertical circle of the arm and the linear motion is the horizontal outward back-knuckle. Following the linear path of travel allows for better visualization of this theme (from both an observer's and the practitioner's perspective), and for the practitioner to more easily understand / be constantly reminded of the general theme of the form.