What Zhao Yu had told the masked man at Guan Qing Hall was not really baseless conjecture. Everything he said was basically true.
However, because of all the tools he had used, what had actually happened was much more exciting than what Zhao Yu had said.
Rewind to twenty minutes ago, when Zhao Yu saw the masked man running into Guan Qing Hall.
After Xiao Hang had told him about the hostage situation, Zhao Yu felt even more uneasy. He had already seen the digging situation inside Guan Qing Hall with the Invisible Drone. When Zhao Yu saw this, he didn't for a second believe that the criminals were digging to find the treasure.
First, that was not really plausible. The thugs obviously knew the location of the treasure. It would be impossible for them to dig for it under the eyes of a watchful audience.