So, Voldemort had to die. But how to achieve that and save Harry? For that question, Draco had no definitive answer yet, but the potion in front of him helped him feel like he was taking back control in some capacity. His mind kept cycling back to the need to heal the wound at his throat, but if Snape had been trying since September, Draco would have been kidding himself to think he had anything to contribute to that area.