"I make no apologies," said Harry, unabashed. "I've faced death far too many times in my life to give very much thought to propriety these days. But anyway, my parents knew that they would almost certainly die at the hands of Riddle. It was simple cause and effect. They wouldn't allow that evil cunt to mark me without resistance, so they knew that whatever "marking me' meant, it would only happen under duress. It was the only part of the prophecy that was certain to happen.