Before they began to make plans on how to attack Barcas, Gaston intervened, "Mr. Oliver, before we make our plans, I would like to know what Mr. Andrew has in mind with our young lady".
Everyone was taken aback at Gaston's intervention because Candice had already made it clear that she would take Andrew as her husband, so they did not know what he intended by that comment.
Oliver was also taken by surprise, as from the short interaction they had had, he had understood that Candice would be Andrew's wife, so he thought everything was clear.
Despite that, Oliver was silent for a second as he thought and instead of giving an answer he asked another question, "Miss Candice did not agree to be our young master's wife?".
They were all silent at the question because although Candice had told them that would be the case, they didn't dare answer that question and just looked at Candice and waited for her to answer herself.