Zhang Zian didn't forget what he came for and returned with his hands full.
He found a high rock at the beach, stood on it, and turned on the underwater loudspeaker. Sihwa's song in an unknown language flew out of the speaker and mixed with some strange sound.
Soon, under the rocks and in the puddles nearby, the marine creatures that he had left behind started moving towards the sea like an ebb. Some were slow and some were fast. Some swam, some ran, and some jumped. Some presumingly local creatures stayed there without moving.
After the majority had left, Zhang Zian put the speaker into the sea and waited for a while. He could not see anything above the sea surface, but he expected it to work.
The coast was quiet again. He also started his journey home.
After driving back to the pet shop, he realized that he had already spent two to three hours outside. It was almost noon.