Writing Tip: In writing fiction, the author is allowed to break rules once in a while. Below is a sentence fragment. The third "sometimes" is what the villain is anticipating, and therefore, more important. Set alone in a sentence fragment brings attention to this "sometimes."
This can also be achieved using ellipses . . . but that is not as strong as a clean break.
The pretty day would lure the lady from the inn. She often walked, sometimes with her husband and sometimes with the parrot. And sometimes alone.