Magic 23 Volume 7

She covered the surface of the whole ring with a thin layer of water membrane without anyone noticing. This means, even if she couldn’t see with her eyes, she was able to determine contender Momiji’s position from the waves caused by the shaking of water.」

In that case, it didn’t matter if she could follow her with sight or not.

Shizuku would be able to tell Momiji even if she were to close her eyes.