Tao Su continued his lecture while Amon resumed cultivating but still paid attention to the lecture. To his disappointment, there was no mention of the infernal branch cultivation. Several details that Amon didn't find from the books were in the lecture, though. So, it was not all a waste of time.
Thinking that most of this lecture was the stuff he had already learned from books, he wondered if he should still attend the next theory class. It was more beneficial for him to just stay inside the aether-rich basement under his house and cultivate. But he decided to still attend a few more and see if any other classes provide benefits.