A few months ago, during her duel with Wang Jiu, she transformed the Yuqing Taoist Armor into a dense black mist and launched a direct attack. At that time, her transition between offense and defense was skillful and fluid. Even as strong as Wang Jiu was, he couldn't immediately counter the force; he had to first use intense spinning to absorb the impact.
But now, after the Yuqing Taoist Armor was unsealed by Yuqing True Master, Li Wanqing could no longer control the Yuqing Taoist Armor as skillfully as before, nor could she turn it into mist. When shifting from defense to offense, the power she could harness was limited and lacked variation... and this sole flaw was precisely seized by Wang Jiu.
No, rather than saying Wang Jiu seized it, it was more like she handed it over herself. In other words, that guy had anticipated her reaction from the start.
