Alright, Zheng Tan finally understood the origin of Liu Ba's name.
After finishing his writing, Liu Ba looked at Zheng Tan and asked, "Can you really not talk?"
In Liu Ba's view, the demons in legends were all capable of speaking, and although he had never encountered such a thing before, he had come across other phenomena that science couldn't explain easily. Once he accepted this reality, his thoughts raced towards the notion of a Cat Demon. But this cat truly had never spoken, not in person nor over the phone; otherwise, they wouldn't need to use the more complicated Morse code to communicate and convey messages.
Indeed, right after Liu Ba asked, he received a "You're talking nonsense" look from Zheng Tan.