Harry was slower to react however, as things finally clicked into place in his mind, and the world finally made sense, "The vials," he muttered, "The small one, with the pipette. The one you haven’t had since Dumbledore disappeared," and Snape nodded heavily. Of course. It made sense. As contentious as his relationship with Dumbledore might be, Harry would never believe he would willingly let him bleed to death if it was within his power to save him.