When Charlton returned to Larissa's side, he finally understood what he felt when Serena said goodbye. It was a feeling of loss, and perhaps he felt sorry because he was too quick to judge.
However, seeing what she was doing, he suddenly felt his blood boiling. He could not understand the sudden onslaught of anger, but perhaps it stemmed from her words. She said she wanted to move on, so she meant that she wanted to move on to the next high-ranking man! Truly, she was unbelievably thick! Not really knowing why, he could only sarcastically scoff!
--
In all actuality, Charlton was not the only one wanting to scoff. Almost all the ladies seeing the blasphemy wanted to do the same. Who does Serena think she still was? Christopher has not danced with anyone that night, not even his own sister. They could all only wait till she gets rejected.