The twist isn't a cable. The legwarmer is actually a rectangle, but the edges intertwine to create a tube and the flowing twist! I know! Pretty neat, huh?
If you page through the magazine, tucked in among 25 beautiful and flattering designs, you'll also find my in depth article on short rows, "The Long and Short of it." It covers the most common short row techniques and most importantly how to use them to completely customize your knits for a bespoke fit.