Board Thread:Character Discussion/@comment-25823557-20150929002100/@comment-27031955-20150930072819

Eh, I took it as Lily getting angry at Emma abandoning her all those years ago and for being the Savior who "took all her light" so it was Lily's punch that caused the thunder like sound. She is after all a powerful dragon child and has live in the Land Without Magic longer than Emma (if only a few days). I kind of doubt that kind of magic can be contained.

Either that or...perhaps it was simply because Lily and Emma were fighting. Because of the connection between them and that parts of themselves are trapped in the other and they're kind of in a yin yang situation now.