Eiro flipped through the books that were laying in front of him as quickly as possible. He was trying to register the information in his mind to use with the Knight of Pentacles, while not immediately forgetting it. It was a bit hard, but as long as Eiro was able to figure out which pages were the most important for now, he would be able to figure something out.
In the first place, there weren't all that many books about memory-manipulation here, so Eiro had to make sure he could squeeze every bit of information out of them that he could.
He copied a few pages down whenever he found parts that were indubitably necessary for him to figure this out, and then, after about two hours of repeated reading of the same books, pages, and paragraphs, Eiro finally stood up and placed the last page that he copied down onto the ground.