Nobody expected this sudden change in the situation. Eleven knew that Meng Lianying had feigned fainting and fired at Mo Ye because she wanted Mo Ye to kneel before her and atone for his sins. While that was something she had pondered upon for a while, she also wanted to see how much Meng Lianying loved Mo Ye. Little did she expect Meng Lianying's love for Mo Ye to be skin-deep enough to feign fainting as she was afraid that Eleven would expose her.
While she was unwilling to get up, she knew that the truth - being told by her and by Eleven - were different should she be confronted. Meng Lianying would not allow Eleven to have her wish and rather hear Mo Ye grunt as the bullets punched into him.
Eleven, however, saw that she was unwilling to get up and decided to tell the truth. Meng Lianying could not allow it to happen and stopped feigning that she knew nothing. Hoping to gun Eleven down, she stood up and fought back.