He slid the knife out of its sheath and held it up to the light, allowing it to cast a long shadow over her face. Then he brought it crashing down – through one of the ropes which bound her. Cho gasped and dragged her left hand, suddenly free, out of the newly loose ropes, but Greyback instantly caught them it in one meaty fist. She struggled wildly, but her delicate wrist was no match for the cage of his own hand. He forced her to curl her fingers into her palm until only her left pinkie finger remained, extending out and trapped between the pincers of his thumb and index finger. With his free hand he rested the knife gently against her fingertip.