After returning with Madam Lin to their housing complex, Amon returned to his routine. Practicing martial arts, cultivating, and studying poison. For the engraving, the basic was all that he could learn at the time. He would need to find a better book or have a teacher to teach him if he was to continue with that subject. Blindly experimenting would not yield him much result, not to mention he had no time for such a random experiment.
As for his negotiation with Lin Fong. The guy didn't give him any definite answer, but he said he would think about it. Amon warned him that if he tried to harm him again in any way, then the deal was off. He would cling to Madam Lin forever and Lin Fong could forget about getting rid of him.