"You're right. Even if the murderer managed to break into the locked room, they had to figure out how to restore it before anyone else noticed."
Li Ang said, "Without using Spiritual Power, it's nearly impossible to screw a loosened nut back onto a bolt through a thick layer of wood. Therefore, the murderer thought of a method: replacing the bolt."
"What?"
Su Xinghuo exclaimed in surprise, "What's the point? If the nut can't be tightened, it just can't be tightened."
"The murderer didn't need to actually tighten it," Li Ang explained. "They just needed to make the bolt *appear* as if it were tightened."
He smiled. "Firstly, the murderer used Alien Species Mussels and vibrations to dislodge the nut. Due to the angle, the nut would inevitably fall onto the soft, flat bed and wouldn't roll away into some corner.
