Zoe raised her hand quickly straight into the air then said, "If you didn't want someone to know what spell you were about to cast you would want to be silent. Also if you had to sneak up behind someone. Possibly also if you had laryngitis and you couldn't talk, or maybe if you were underwater." She smiled at the professor hoping that she had good answers this time.

She was babbling again. At some point in time Zoe might as well give in to her affliction and stop punishing herself for it.