"I think what must come into this, is where does a sway end. We may have sway as in an Open Telemark on two and none on three but the sway has to continue untill the beat of three otherwise it will be too abrupt an ending to the sway I never questioned at that time why the other step was used, everybody just did it."
Don, the sway in an open telemark is largely a result of the man leaving his left toe in place where it fell on step one at the same point on the floor throughoughout most of step two. As he goes to take step three and moves the leg, the body will naturally return to an upright position since the unique position that caused it has dissolved.
There is no need to worry about abrupt changes in sway, because sway is not an action into itself, but rather a result of fundamental actions of the step. If the fundamental actions are done right, the sway will automatically be right.
Actually this is true of many things written in the book; they are not instructions at all, but things you would observe when the figures are well dances. You can work backwards from those observations to deduce instructions for dancing, but those have rarely been written down. Instead, the book is usually either ignored or taken as an instruction manual - a shame, because it has a lot to teach when you read the implications between the lines.