Ah, but what causes that film? Differences in temperature. Sorry, I forgot a point in my post.
Around the ice, the air is usually above melting point. This warms the ice thoroly. However, all heat is transferred up. Creating the film.
But, I was still correct, from a point of view. When you apply pressure, friction, and your own bodyheat, it creates a thicker and more slippery film. That's what I was getting at.