The stone was taken down by Liu Ruyan and handed over to the guards. The Dragon Group has hundreds of ways to interrogate, and they don't believe the stone won't talk. However, Liu Chen now has other concerns; he already feels that this stone probably doesn't know much, and he may not know the whereabouts of Mr. Hua.
But this is also Liu Chen's speculation. Whether the stone knows or not will only be understood after interrogation. After all, Mr. Hua was captured by the stone personally and was also sent away by him personally. So everyone is holding onto hope of extracting something from the stone's mouth.
