Audience members reportedly booed and even threw things as the unfortunate Richard Hetherington was forced to replace French tenor Roberto Alagna in his role as Prince Calàf for the challenging Puccini opera, after Alagna fell ill following the second act. While the performance did continue, some audience members reportedly booed and left, while one fan claimed that people threw things. During Turandot at Covent Garden, Roberto Alagna, playing Calàf, took ill and couldn’t come out for act III. Enjoy unlimited access to 100 million ad-free songs and podcasts with Amazon Music Sign up now for a 30-day free trial. A spokeswoman for the RBO said: “Roberto Alagna was taken unwell during yesterday evening’s performance of Turandot, which prevented him from completing Act III.