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I think in this day and age, we kind of expect pop music performers to lip synch when performing in certain venues. Not that I agree with it, but it's a bit difficult to sing live and autotune. Not to mention, the dance routines.

But the question is illness, food poisoning, alcohol, or drugs?

Kudos to the dancer that kept going though. I mean it's pretty tough to see someone vomit and not vomit yourself, but it takes a pro to stick to the routine and not do it.