That was right. Since they had sensed the powerful aura Ling Tian had released, he clearly hadn't returned to the God Realm. With his strength and the power of the Eastern Emperor Bell, sending Chi Xue and the others a signal to attack would have been easy, especially with the Lord of the Universe making no deliberate effort to block him. But since no signal had come, he was telling them they didn't need to support him just yet. Even the Lord of the Universe, even within the Demon God Forbidden Ground, wouldn't find it easy to intercept Ling Tian's message. What was more, Chi Xue and the others hadn't sensed the Lord of the Universe's aura—not, at least, any powerful aura besides Ling Tian's. That made it even easier for Ling Tian to send them a message.
Since Ling Tian hadn't sent a message, Chi Xue and the others couldn't act rashly. Doing so might very well disrupt Ling Tian's plans.
Of course, Xiao Shi had also offered a reasonable explanation for why Ling Tian had used the ultimate compression of his Externalized Small World: he was showing the Lord of the Universe what he could do to earn the right to negotiate with him. Ling Tian couldn't very well demonstrate his method of compressing a Small World directly to the Lord of the Universe, so using the ultimate compression of his Externalized Small World was the best way to show it.
Everyone knew that Xiao Shi understood Ling Tian best. Since he said as much, they didn't act rashly and continued to wait patiently.
Before long, Chi Xue and the others could no longer sense Ling Tian's aura. His clone left behind confirmed it, but they weren't worried. It meant Ling Tian had returned to the God Realm,