Progress through the level until you find a well. Use your axe on the well to destroy the cover, and then make a rain cloud above the well to fill it with water. Make a lightning cloud shock the pile of coins next to the well, and then use lightning on the coins closest to the well so they fly into the well, knocking a barrel loose. Make one more rain cloud above the well to get the barrel out, and then use your axe to free the lad.