Finally, Mrs. Henderson found her voice. "Sarah," she began, then stopped. She tried again. "That was... I don't understand. How did you...?"
Sarah stood up from the piano bench, her legs still shaky from adrenaline. "I've been practicing," she said simply.
"Practicing?" Mrs. Henderson's voice cracked slightly. "Sarah, that piece... do you understand what you just played? That was Chopin's 'Revolutionary Etude', Op. 10, No. 12. That's a piece that piano majors in college struggle with. That's a piece that requires years of advanced training."
"I know what it is," Sarah said quietly.
Mrs. Henderson stood up from her chair, her evaluation sheets falling to the floor. She walked towards Sarah with an expression of complete bewilderment. "Where did you learn to play like that? Who's been teaching you?"
"Nobody taught me that piece," Sarah said. "I learned it myself."
"That's impossible."
Sarah met her teacher's eyes steadily. "No, Mrs. Henderson, it's not impossible. You just never thought I could do it."
The words hung in the air between them like a challenge. Mrs. Henderson's face went through several different expressions: surprise, confusion, and then something that might have been shame.
"But your playing in class, your technique... you never showed any sign that you had this level of ability."