Land Walkers will almost always use Sleep Shot on Kaim. That's fine though since Sarah takes them down more easily anyway; One Winda should do it. In one fight with three Land Walkers Sarah will HAVE to do it, in fact. The Land Walkers will be on a different train than you, and Kaim will not be able to land physical attacks. In that fight there's a magic generator that will keep restoring your MP to make sure that the battle is winnable.