If you get stuck in the Dragon room due to a glitch, resolve it with the following work-around: Play as Hermione and choose her cat on the spell wheel, then head over to the far left corner. Jumping into this corner will kill your character. However, while jumping into the corner, rapidly tap the "release pet" button. It may take several attempts but the pet will appear in the lesson room above. From here, the player can leave the lesson room and continue the game.