Then, it was about trying to understand the reaction furnace in his body better by following those mobile patterns and applying that understanding.
Sometimes, he even had to shout "Ah, ah, ah."
He could call it "practice," although it was quite different from the usual concept of practice.
"My 'practice' is different from your 'practice,'" he said.
As he practiced, he started to get a headache. The energy from the reaction furnace was transported to various parts of his body through the pipes in all sorts of magical ways, with some of it related to the brain, and the part that involved the brain was the most complex.
However, the book explained that such practice would have this side effect of causing headaches, and the way to deal with it was just to endure them until mastering a particular technique, after which the headaches would cease.
