After the song 'waltz of the flowers' ended, Charlton led Serena back to the table where the rest of the ladies were. Some of Serena's former classmates approached, engaging her in small talks.
Looking at her dance card, Serena saw that her next scheduled dance was the Quadrille with Christopher but that's the 14th song for the evening and was slated as the 2nd song after the interlude. Calculating the time, she approximately has an hour at least before that. She looked around and saw Geoffrey who was on the dancefloor occupied. If she slips out of the ballroom now, he won't notice.
She looked at Charlton who was talking to some noblemen. Their eyes met. She blinked once and looked away. She smiled as she excused herself from the other ladies.
Charlton knew that Serena just slipped out of the ballroom. He looked around the room and saw Geoffrey still dancing with the daughter of Marquess Ligeti. He excused himself from the gentlemen to follow.