"See, that spell you're trying? It's in here." She slaps the large gelatin with her hand, setting it wobbling violently. "What you're trying to do by casting it is scooping out something you don't know where it is or what shape it is or how to get to it. I'm not saying you can't do it! But I am saying if you want your gelatin to have a neat new shape, you want to start with a manageable chunk.