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One and a half minute ago...
Mochi and Kokoro had made up a plan. They had decided to separate the two to not fight together against them, and defeat one of them individually! Whoever were to defeat the other first, the other sister would join the one that was still taking too much time and demolish the last rival.
It was a very simple plan, but one that they were confident on being able to pull off.
When the shadow weapons exploded, the shockwave was strong enough to blow away Kaguya. In that time, Mochi targeted her, while Sadako, the foolish Yokai girl which they secretly despised due to her origins, was left to be brutalized by Kokoro to her heart's content.
In fact, they underestimated Sadako so much based in her initial impression that they found Kaguya a greater threat, and Mochi believed that Kokoro would be able to defeat Sadako on 1v1.