Suppose character A says something to character B. Character B has a physical response, and then a verbal one. Where do I put the physical response? In the same paragraph as character A's comment, or in the same paragraph as character B's comment? My instinct says the latter, but I don't know the rule on this.
Por ejemplo:
"Your father will never let us be together," said Rothschild through the thin window curtain separating him from the royal suite. "You know how I feel, but you know how your father feels, too, Cynthia. No sane man would stand up to him."
Her anger roused, Cynthia defiantly threw her panties out the window, narrowly missing Rotchild's immaculately square-jawed face. "I know how my father feels," said the girl. "But I also know how you feel. I know how you feel inside of me, Rothschild, and that is all that matters to me." She opened the curtain and reached out to Rothschild, her nubile body sinking deeply into the warm ocean of his embrace.
In this overly dramatic, idiotic example, the "action" that character B responds with is "Cynthia defiantly threw her panties out the window, narrowly missing Rotschild's immaculately square-jawed face." I am assuming that that piece of action needs to be tied to the paragraph of Cynthia's dialogue. But am I wrong? Or is it optional? If it is, what is better?
What about less obvious "paragraph starter" physical responses, like, say, "Cynthia nods her head"?