I have a beginning student who blows a large, fleshy bit of internal top lip into the cup of the mouthpiece. Imagine a large cupid's bow situated BEHIND the center of the top lip. When he blows into the mouthpiece, the extra lip collapses inward, his aperture being formed by the inside of the top lip, and usual spot on the bottom. I learned this today when I asked him to use the embouchure visualizer. Can anyone recommend a course of action? Thanks.