Although Chi Xue and the others were very powerful, they could no longer pose any threat to Ling Tian or Xiao Shi. At least in a direct fight, both Xiao Shi and Ling Tian could easily defeat them, even if Chi Xue's group numbered several dozen, or close to a hundred.
However, Chi Xue and the others wouldn't fight Ling Tian's group head-on. Barring any surprises, once they left the God Realm, they would devote themselves to helping the Lord of the Universe complete his tasks. If they finished those tasks ahead of time, they still wouldn't be able to threaten Ling Tian or Xiao Shi, but Hua Min'er, Feng Lingzi, and the others would be in danger. After all, they would have no choice but to forcibly break free of the Lord of the Universe's control in the future.
The tribulation they had just experienced showed how difficult it was to break free of the Lord of the Universe's control by force. Even though Ling Tian's group would undoubtedly weaken the Lord of the Universe considerably by overcoming this tribulation, and even though Hua Min'er and the others would trigger the Ultimate Lightning Tribulation much later, further weakening him, they still might not be able to escape his control.
So, to give Hua Min'er and the others a chance to break free safely, Ling Tian would undoubtedly find a way to kill Chi Xue and the others in the future, eliminating the danger of their getting there first.
Of course, Ling Tian knew the Lord of the Universe would do everything he could to prevent them from "killing one another." After all, the more people who kept helping him complete his tasks, the better his chances of achieving his goal. To prevent that from happening, he would try to