After becoming a demigod and gaining some level of control over Sefirah Castle, Klein was able to prevent its aura from permeating out into the real world and augmenting him. This made him stop considering similar problems. After all, this would result in abnormalities, causing him to be recognized by the Beyonders of the "Fate" pathway at a glance—it was rather unsafe. And at this moment, once he received Will Auceptin's reminder, he felt that it opened up new possibilities.