Wang Jiantao and his companions weren't there to assassinate Lu Chen, so they didn't start with a surprise arrow attack on Lu Chen's carriage. Instead, they stepped out in the open and surrounded both the carriage and the guards from the Prince's Mansion.
At that moment, Bai Qingqing said expressionlessly, "Who are you?"
Wang Jiantao and the others were wearing cloaks and their faces were covered with cloth, concealing their full visage. However, Bai Qingqing obviously knew who they were and her question was purely rhetorical.
Having grown up in the training grounds of the Shadow Guards, Bai Qingqing was, after all, a disciple of Wang Jiantao. She was very familiar with the martial aura Wang Jiantao exuded. The moment Wang Jiantao made his appearance, she knew it was him.
Wang Jiantao then said coldly, "Commander Bai has been quite busy lately, so busy that you've forgotten your own duties."