Flying? Like Unconditionally at the EMAs? Like Wide Awake at the BBMAs? We're screwed.
She flies around during PWT and sounds fine. Plus they'll be backing vocals and what not, chill. As long as she's strapped in properly it shouldn't be too horrible
Actually I could see it if it were for the finale of the performance, as the sky is full of fireworks, and Katy is belting out her little ad-libs for the final chorus of Firework, zooming around the stadium on a shooting star. Could be cute, could be disastrous.