Teddy did not know why, but his instincts told him the troll would be a distraction. However, he did see Harry and Ronald Weasley sneak off toward the dungeons, where the troll was supposed to be. So, naturally, he followed the two to the girl’s bathroom to see the troll smash through the stall with one swoop of his club. And then, the Weasley boy jammed his wand in the troll’s nose. 