Ning and Mu were the only two people from the Dark World that were still alive. They were trying to find Long Chen; however, they located the Origin of missing Qi before finding Long Chen.
As Ning removed the stone that was covering the entrance of Long Chen's cave, he found the entrance. Even though it seemed like something made by a human, they still thought that it was a beast. Which human can take in so much Qi for a breakthrough, after all?
"There it is... The beast is hiding inside that place..." Ning commented.
"Wait a minute. If a beast is hiding inside, who covered the entrance with a stone?" Mu asked, raising a valid question.
This question also got Ning to reconsider. "Do you think it's a trap?" Mu further asked.