"Yes, Harry," Remus says, when it’s clear Sirius cannot, "the bad man—his name is... is Voldemort—he... he was targeting your parents, since they were strong fighters in the war. They were in hiding, but..." Beside him, Sirius sniffs, hiding his face with his hand. "Someone betrayed their location, told him where they—and you, for you were only a baby at the time—someone told him where you were all hiding, and he went after you." Remus forces himself not to look away from those wide, serious, green eyes. "He killed both of your parents that night, and he tried to kill you, but something happened. Something your parents did saved you, and the curse rebounded. Instead of you, he died, and left you that scar."