Curse

Last night, our Fiordeligi cover , who has been singing with us for the past seven shows, has lost her voice. First half went well, but for the second, for an extremely mysterious and unknown reason, (allergic reaction? nerves? voodoo?) her voice was absolutely gone.
And since she IS the cover, there is nobody else.
She kind of marked through her big aria, but completely stopped singing after that.
All our recits, were softly spoken by her, sung by me, then the big Finale (which is us singing in thirds), well, was sung solo, by your humble mezzo, while our poor silent soprano was trying to do her blocking, hardly managing to see through a stream of flowing tears.
The show must go on, and that's what happened.
I sang HER lines in "E nel tuo, nel mio bicchiero...", which turn into a duet with Ferrando, which turns into a trio and lastly a quartet. I started their duet with him, then I sang MY line. It still sounded like some kind of a lame trio, as the entire rest of the opera ended up being.
I wish I could sing in two voices at the same time, ( some people can! did you know that?) but all I could do was to sing with only mine, shakily, (gosh, I think I was physically shaking) my own phrase, and wonder how wrong it sounds, missing the top line in all these ensembles.
This was like one of these singer nightmares we get during our anxiety dreams. I still can't believe how strange this whole summer has been so far.