Red spark spell

This spell can burst out Red Sparks above the sky. During the Triwizard Tournament, as Fleur Delacour was stunned by Viktor Krum below a Imperius Curse, and she was starting to be sucked in by the maze, while Harry Potter found her, he setted a spell which bursted out a red spark above the maze, which was a signal to let the maze and the professors patrolling outside the maze to save her.