tracking sense

I stopped in the alley outside Butters’s apartment and sketched a circle on the concrete with a small piece of pink chalk. I closed the circle with a tiny effort of will, drew out one of the hairs from the plastic bag, and held it up. I focused the energy of the spell, bringing its different elements together in my head. When we’d started, Harry had let me use four different objects, teaching me how to attach ideas to them, to represent the different pieces of the spell, but that kind of thing wasn’t necessary. Magic all happens inside the head of the wizard. You can use props to make things simpler, and in truly complex spells they make the difference between impossible and merely almost impossible. For this one, though, I didn’t need the props anymore.
I gathered the different pieces of the spell in my head, linked them together, infused them with a moderate effort of will, and then with a murmured word released that energy down into the hair in my fingers. Then I popped the hair into my mouth, broke the chalk circle with a brush of my foot, and rose.
Harry always used an object as the indicator for his tracking spells—his amulet, a compass, or some kind of pendulum. I hadn’t wanted to hurt his feelings, but that kind of thing really wasn’t necessary. I could feel the magic coursing through the hair, making my lips tingle gently. I got out a cheap little plastic compass and a ten-foot length of chalk line. I set it up and snapped it to mark out magnetic north.


Brief Cases, Bombshells, Page 228-229