Another assistant quickly runs on stage and whips away the cloth, revealing... a cardboard cutout? Robyn has taken Laurel's place? As the cloth falls, we see that the assistant holding it is Laurel herself!
As for Robyn- at least the Magician didn't use the shredder after all. But she's still flat as a board... and now has a few extra holes punched in her. Somehow, though, I think the Magician may fix that all in his next illusion, as he takes the flattened Robyn from the cruel device and Laurel wheels it off stage...