User blog comment:IamJakuhoRaikoben/Chapter 275: The Intoxicated Falcon, Review./@comment-1755328-20120317113138

Lucy's singing because it could be spell she used to save everyone from the collapsing building, but in order for the spell to succeed, she had to stay inside, sacrificing herself. This could be an explanation as to why Levy was the narrator of the previous chapter, at the supposed end of the tournament.