You are mistaken :). You need to empty the fog location since there is a better chance that the vilain will not bo there (2/5 instead of 3/5 with 3 players) and NOT close it when empty. Then work on other location. When you enconter the vilain you send him to fog and check if he is there with the ally Dolphin. Empty and close Scar Bay THEN kill the vilain! Not easy to do and you still need some luck but it how i made it :).
