What has happened is NinhJa kicked a player from the game but they are still in the chat, if I understand it correctly. There is no actual way to remove a player from the chat itself. You can create a copy of the game (detail page>setting button>copy/clone game) completely then carry on with it. You would have to reassign the sheets to your players after they enter the copied game. As an experiment, you can try to force a game refresh by changing your audio/video to none then back to what it is originally but I'm not sure if that will work.
