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"It's hard to watch, it's really hard to watch," Gary Barlow told the 16-year-old hopeful. "I don't know how to solve this problem. On the live shows it's excruciating watching a car crash happen."
The special commemorative episode saw the competitors reliving history by meeting previous contestants and covering their songs.
The night also featured performances from 2009's runner-up, Olly Murs.