Good episode. Somewhat similar to Die Hard. To answer the person below my review: Materials like metal(cable), porcelain(coffee cup), concrete, etc, etc, all have different chemical compositions. I don't have a bachelor's degree in chemistry, but basic high school science shows all matter reacts in different ways to each other. For example: Salt, an Ionic compound, is Sodium Chloride. These two compounds together form an edible substance for all. Separate from each-other, Sodium is a radioactive metal and Chloride is a annion of Chlorine, a Halogen element. It is possible for a chemical compound to damage one and not the other. The same way salt helps as a whole, yet kills organic material when separate. If you want, try a chem 101 class at community college. It may change the way you view this world. It did for me.