Instead of smiling back, Spencer looked rather frustrated, his brow furrowing. "Meg," He began in a tone of voice that he always took on when about to lecture someone, "How do you know someone hadn't polyjuiced to look like me? You should've asked a question only I would know the answer to."
He strode into the apartment, turning to face her with a disapproving look. "You haven't any magic, you need to be careful."