The dosage of the Paralysis Talisman isn't large, it will merely cause that person's arm to be paralyzed for a short while, without significant side effects. By the time they return, the effects will be gone; Luo Yirui controlled it very well.
Currently, only Luo Yirui can use the Paralysis Talisman. He developed the remedy a long time ago; it's his exclusive formula, and has never been made widely known in the small courtyard.
This is naturally due to Beisitian's intentional arrangement. Luo Yirui must have means for self-defense, but Beisitian didn't want him to harbor too much animosity at such a young age, hence this became Luo Yirui's exclusive method.
No one outside knows about it; those who do are very close to Luo Yirui. Besides, it's not considered very rare, so no one pays attention.
This way, Little Fatty is exonerated, considering he never even touched him from start to finish, providing no excuse for them to cause trouble.
