Jiang Feng was surprised that the group from the Yin Sect knew about the Great World of Tianji.
But when he saw that Qingqiu still had the power to handle himself, he did not join in and instead continued to listen in to the content of their conversation.
He needed to find out how those from the Yin Sect noticed the existence of the Great World of Tianji, the Sea Monsters, and the mermaid.
If the knowledge of this was spread out, it would undoubtedly cause mass panic, and might eventually lead to the destruction of the passageway to the Great World of Tianji.
He had already told Qingqiu when they left the Bermuda Triangle to not leak anything out about the Bermuda Triangle. That meant that these people from the Yin Sect had already known about it far earlier.
Or perhaps the other two survivors in the Yin Sect that had escaped the Bermuda Triangle had exposed what happened in the Bermuda Triangle.