I've been a bit troubled for years by the call "roll away" (with or without a half sashay).  It's usually taught as though "roll" was an active verb, something that one dancer, most often the lark, does to the other dancer.  Perhaps it would be more balanced if "roll" were treated as an active verb, so the roll is something that the dancer making the 360 degree turn does with the assistance of the partner who does not spin.  

-David