They had graduated together from Juilliard, and she had given up her job as a concert violinist to be his coach, sitting in the audience, observing him and giving him feedback.
Eles formaram-se juntos em Julliard e ela desistiu do trabalho de violinista de concerto para ser treinadora dele, sentando-se na audiência, observando-o e dando-lhe "feedback".