It was easy enough to keep on with the change in subject, as he knew he would drive himself mad if he dwelled on her quiet admission. Did it mean she wanted children? If Higgs did propose and she said yes, would they start trying for children soon after? Such questions were very good reasons for him to not allow his mind wander down that path.
He also refused to follow her gaze, instead focusing on the fact that he was leading her onto the dance floor. He was actually going to get the chance to dance with her! Within the realms of propriety, of course, but it was still a small win for him that he was determined to enjoy. And Robert did, indeed, know how to dance. There was a certain grace in his movements that came from years on the stage, though he wasn't performing here and now. He wasn't slipping into some character to charm a crowd or manipulate emotions--he was simply Robert, a man dancing with a beautiful woman whom he greatly admired and adored, if from afar most of the time.
One hand settled at her waist, the other keeping hold of her hand as he led her through the dance. He enjoyed having her close this way, though the music and crowd made it difficult to talk in the midst of the dance floor. He didn't mind, though. He didn't need to talk to enjoy her company.