Tang Xian didn't sabotage. He was a human who loved to protect little birds.
Mockingbirds and cat-eared bats alike favored dry and cool places; they mostly nested in caves that were well-ventilated yet devoid of light.
Cat-eared bats had a bloodthirsty nature; if the mockingbirds weren't fluent in the language of the cat-eared bats, they would have a hard time surviving. These creatures had cat-like ears and a temperament somewhat similar to cats; they would toy with their prey just as a cat would "play" with a little mouse for a long time before finally killing it when they lost interest.
Tang Xian liked cats, but he was always aware of the cruel wildness within them. The cat-eared bats were even worse.
Mockingbirds shouldn't have appeared in the Forest Ocean, so he could imagine how miserably one mockingbird could've been bullied by cat-eared bats to the point of being driven from home.
The mockingbird returned quickly, efficiently catching a Green Phosphor Fish.
