Rio used absolute stealth to open up a massive distance from the battlefield so as to make himself difficult to track in case any monster from the battlefield tries to pursue him.
Although Rio killed most of them and paralyzed nearly all of them, there might still be some lucky fish that might have slipped past the net and might try to track him down.
After walking a significant distance in absolute stealth mode, Rio once again started flying to pick up the speed and started experimenting on the miasmic crystal all over again.
Rio was a powerful S ranker and had mana and miasma as his energy sources, so he didn't need to worry about food, sleep, or breathing at all.
He just kept flying at a fast speed without stopping even once, and this way he crossed hundreds of thousands of kilometers of distance.
Rio avoided monsters and terrains as he flew forward for half a month straight!
