Everytime I go to Poseidon's Challenge to face the 3-headed dogs and small pups and defeat them, the red force field's never go down. I've beaten every one of them but the area will not let me pass. I tried using Poseidon's Rage to jump over the wall that's blocking me but I don't have enough magic to go over it. Can someone help me figure out what exactly I'm supposed to do, please???