Reflexively, Harry shoved Eric back down against the floor and broke off the gaze. He hadn't know what Eric was reacting to, not until the vampire had tried to actually attack whatever it was. Then he'd seen a reflection of it and a lifetime of instinct had taken over.
"You can't attack something that's part of my soul," he finally managed to say. His voice was cracking and dry. "And when last I saw him, he'd just missed his chance to be free again. He's not here."