The island has weaker gravitational and spiritual pressure. Even the metal ball that is the source of those things are also weaker
Since that is the case, Cairo immediately sprung into action and defeated the 'boss' of this floating island. It was much easier to defeat than the one back at his first island
As soon as Cairo destroyed the metal ball, the island vanishes and he was back in his top condition again. Whenever the gravitational and spiritual pressure vanishes, Cairo would feel comfortable
Although Cairo is already used to enduring the pressure 24/7, it still feels like there is a huge mountain in his back that he needs to carry. It was an uncomfortable feeling
Thus, whenever he isn't enduring the pressure, it made his mind and body feel lighter than before. Never before he felt this free. But of course, he knows that the pressure is beneficial for him