Spencer Tracy was a man who did very much what I do on a set, and that is, he comes down and he does his job, and then he goes back to his dressing room. ↗
I once saw my mother playing Mary Magdalene in a parish event. But she had to put the role aside in order to go and front the choir who were singing at the same occasion. She left the stage halfway through the Crucifixion. ↗