Molten lead is injected into your veins, it goes to your heart and from there gets pumped to your extremities. When it reaches them your extremities (fingers, toes, such) and then hardens, you lose feeling where it hardens. From there it keeps moving up, but strangly not hardening in your brain. eventually you have no feeling anywhere besides your brain and upper chest. Just then you feel a pressure in your head, you can't explain what it is, then you realize what it is. The lead is hardening around your brain, you slowly start losing things, first your sense of hearing, then the sense of sight. You lose all feeling and then you slowly lose conscienceness and end up dead.