Now that they're on the other side of the world, they'll be able to travel a lot faster. They're going to have to fight a lot more than they used to, but they can do it because they are mirrors of each other. They can see who the other person is, and they can know who the real person is. They don't need to fight each other, though, because they know each other's identities. They just need to get off of the ship and find a way to do it.