You need to read Scriveners book -- his theories on the usage of sway ( the whens, wheres, whys and hows ).

And the remark was about Whisk only ( lady ) ,----- although-- I would not over emphasise the introduction of sway at too early a point in any specific figure .

the body,in motion, many times has a natural tendency to " defend " its self .

Do not rely on rev. tech completely for anything other than exam work-- many points of techn. may change due to circumstance, at higher competitive levels .