In Merlin’s point of view, the culprit had only tampered with surveillance footage within the hotel. If Fisher and the Japanese men had met outside before, it would be difficult for them to avoid all city surveillance.
If Fisher could provide him with the time and place where they had met before, he would be able to find the video of these people.
Charlie had left The Palace Hotel with Quinn, Dorothy, and Janus while Merlin was mobilizing the police to search for the video data based on Fisher