Lu Fang narrated carefully to Yeong and Alfred how Andrea had fallen into the water. He started from when she received the call from Gustavo's brother.
They were back at the lighthouse's location for the man to give specifics on how it all went down. Hanxi and Han-joon served the best way they could, giving details of how they were caught in the first place.
Taking into account from where they had tied Han-joon and Hanxi, to the gunman's perfect timing, Lu Fang realized everything was orchestrated. They purposely shot Andrea when she stood at the very spot where the water was clear and deep enough below.
Nancy's words suddenly flashed through his mind. Project Zero supported her. What were the chances they planned this from the very beginning? They merely fueled Nancy's greed and created an opening to bring his wife on this island.