The boy fell to the ground in pain. Voldemort looked down at the writhing body below him, and smirked. Victory was sweet. He pondered whether to kill Harry then, or to watch him be tortured for a few moments more. Killing him would be the smarter idea, he had made the mistake of waiting to do it once to many times.
At the moment he raised his arm, a quiet beep emanated from his watch, too quiet for the boy who lived to hear, but loud enough for the dark lord to. Immediately he stopped, and inserted his wand into his pocket, and left the scene.
The Death Eaters watched in confusion, but Severus Snape knew. The ex-potion's teacher sighed. My Little Pony was on, and his lord couldn't miss the episode, not even for Harry.