Pike dug his index finger into the soft tissue beneath the man's collarbone where twenty-six individual nerves joined into the brachial plexus. The supraclavicular nerve, which carried information into the spinal cord, ran close to the skin at that point, following a groove in the bone. When Pike crushed the nerve bundle hard into the bone, the entire brachial plexus fired a pain signal not unlike that from a root canal without novocaine.