What really went on in the maze

In the Goblet of Fire, the last task, the contestants are in the maze. Nobody knew where Fleur or Cedric were. They soon saw red and green sparks. Thhey thought someone was in trouble. They ran to where the sparks were coming from. When they got there they saw Fleur shagging Cedric senseless. But there were still sparks? They were coming from Cedric, just not from his wand. (wink)