"Three parts became one through this ritual." Rising, he gestured Snape to approach to the bed again. Lightly lifting the blanket, he revealed the mark that Snape had not studied for now. "The knowledge," he gestured towards a book, that formed the base of the design, "the tactic," he indicated the chess-piece, that stood on the book, "and the power." a lightning bolt seemed to hug both the king and the book. It took Snape a few seconds to realise that Harry's lightning bolt was on the same position on the young man's chest, as his own. "No matter who he goes against, you, me or even Dumbledore. From this day forth, his mind is protected. And with his friends in his head, should they so wish, even his body."