Although Biles had witnessed Phil's severed hand, Weber's hanging, and Mr. Magician's palm fused from worms, and also had a certain understanding of the horrifying anomaly brought about by 0-02, his lacking level and experience made him unaware of the true horror behind this matter. He mostly explained it away as a horror tale coming to life.
Therefore, despite feeling afraid, he mustered up his courage and quickly approached the rectangular table under the watch of the magical Magician and Grounded Angel. Of course, him being from the Sailor pathway was partly responsible.
Within two or three steps, Biles had reached a spot where he could touch the brass book.
Without thinking, he reached out his right palm and grabbed the brass pages on 0-02 and quickly flipped them.