In a 5- or 6-player game of King of Tokyo, there are two spaces in Tokyo: the city, and Tokyo Bay. Normally, if a monster is inside Tokyo, and a monster outside Tokyo attacks, the monster in Tokyo has the option to leave Tokyo, yielding to the outside monster.
How does this change if there are two monsters in Tokyo? If a monster outside Tokyo attacks while there are two monsters in Tokyo, can both monsters yield, leaving Tokyo Bay empty? Or is one of the monsters forced to stay behind and take another beating before they can leave?