How to Beat Poinsonous Forest of Sorrow - Exit Room in Find Mii II

The Forest of Sorrow - Exit room in Find Mii II is filled with poisonous gas.  To neutralize the poison in the room you must have two yellow Miis be in a row, so they automatically team up to make a sandstorm to neutralize the poison in the room.  The yellow Miis can even be just level 1, as that is what I hired to of from my old allies.  Even though together they are only level 3, they could clear the room with their sandstorm when my level 7 yellow Mii ally failed (did not even try this guy on purpose, just was the Mii I had when I first entered the Forest of Sorrow - Exit).