She had to add adlibs throughout the whole thing so the song doesn't finish before the last model finishes her walk. She even repeated the chorus twice at the end.
But it does fit the show, because usually they have a ballad slow moment, and I really liked this much more than Hozier one year, or A Great big world which were a mess.
Also some of those girls were just... HORRIBLE. My gosh, the one that whipped her hair