Ole-Henrik

Please, can someone help me? I've gotten to when Cartman teaches you to cup a spell and throw it on your opponent, but every time I try to follow his instructions, the game doesn't seem to register me pushing the "A" and "D" button. So Cartman just keeps on trying to teach me the spell, and I can't go any where. Is this a bug? Has anyone else experienced this? In advance, thank you!