Louis Koo (古天樂), Louis Cheung (張繼聰) and Jessica Hsuan (宣萱) filmed A Witness Out of the Blue (犯罪現場) movie together. A particular scene illustrated that Louis Cheung was forced to go into the water by Louis Koo and he jumped into the water immediately, despite it was filthy during the shooting at Ma Wan. He also swallowed some water and Louis Cheung said once floating above the water: “I conquer a sea city today and get to see the nature.”

Louisa also thanked the film director for arranging him to go into the water during summer: “Every outstanding artiste must film water scene and my wish is considered granted. I really feel like jumping into the water upon working together with Louis Koo and do not feel mad at him, although he forces me to jump into the water.”

Louis Koo responded immediately: “This scene is requested by the film director and I follow the script only. Initially, I feel worried and he is standing up as the water is not deep. I need to leave by riding a boat at high speed and worry about hurting Louis as well.

Source: https://hk.entertainment.appledaily.com/enews/realtime/article/20191002/60108204