The whole interaction had been witnessed and overheard by Berucha, who quietly observed on the side. He couldn't help but feel anxious, terrified, confused, and doubtful at the same time.
Berucha was greatly shocked when Vaan's words seemed to imply he would betray Duke Zaahir's faction and join Duke Gamliel's faction.
However, he also found it understandable.
After all, joining Duke Gamliel's faction had more benefits, not to mention a better living environment, than Duke Zaahir's faction. If Berucha could join Duke Gamliel's faction, he wouldn't have turned to Vaan and Duke Gamliel's faction.
Nevertheless, it took great courage to betray Duke Zaahir. Traitors who earned Duke Zaahir's wrath would undoubtedly die a terrible death once they fell into his hands.
Berucha would lose his backer and return to a mediocre life if something happened to Vaan. As such, he was anxious and terrified.