lit. Xiang Zhuang performs the sword dance, but his mind is set on Liu Bang 劉邦|刘邦[Liú Bāng] (idiom); refers to 206 BC plot to murder Liu Bang, aka Duke of Pei 沛公[Pèi gōng] and the future Han emperor, during a sword dance at the Hongmen feast 鴻門宴|鸿门宴[Hóng mén yàn]

an elaborate deception to hide malicious intent