"So that's why! This was the purpose of wearing such noisy boots and acting like she didn't care. Hannie used it to create a misimpression. She could actually move around without making a sound!" Mrs. Manas exclaimed.
When a person is used to a sound, it would create a sort of associative biases, making it impossible to consider the possibility that she could move soundlessly. In other words, it created a cognitive blind spot.
Lin Sanjiu was shocked by what Mrs. Manas said and quietly regretted letting her guard down for a moment. She should have kept her higher consciousness scanning at a wider range. Being too anxious to recover her body, she had become overly frugal with using her higher consciousness.