After analyzing the situation, Ling Chou and the others knew they couldn't return to Ling Tian to cultivate the Nine Reversals Heavenly Technique. If Chi Xue's disciples tracked them down and attacked them right in front of Ling Tian, it would be much like Ling Chou and the others attacking Chi Xue's disciples in front of him back then. Ling Chou would never allow that, so they would rather take the risk and cultivate the Nine Reversals Heavenly Technique out in the open.
Fortunately, the God Realm was vast, and it was still shrouded in dense fog. Chi Xue and the others didn't have many people on their side, so it was nearly impossible for them to find Ling Chou and Chu Ying in a short time. And cultivating the Nine Reversals Heavenly Technique and returning to their peak wouldn't take Ling Chou and the others long—probably only a few thousand years. It wasn't impossible for them to evade Chi Xue's disciples' search for that long.
Ling Chou had also thought of a way to stagger their cultivation of the Nine Reversals Heavenly Technique: one of them would cultivate the secret art first, while the other remained at peak strength. That way, even if Chi Xue's people found them during that time, they might still have a chance to escape. It would be relatively easy for either Ling Chou or Chu Ying to flee, and the one who remained at peak strength could take the other into his Small World.
Once the cultivator who had practiced the Nine Reversals Heavenly Technique returned to peak strength, the other would begin cultivating it. That would ensure their safety to the greatest extent, making it unquestionably the best plan for Ling Chou and the others.
Chu Ying was clever, too. She immediately understood