[Boshusan]

I don't think this was a filler, it's just that the tone was lighter than the "oh crap" escalation from the previous episodes, and the shows needs it for pace sake. There's a new character, great comedy and a cliffhanger, so it's not really out of the place.

I'm reluctant about breakdancing being such a serious matter since the begining of the show, but it's clear now it WILL be important. At some point Mai dancing will bring a major resolution to the plot. Don't forget she's the daughter of the priestess of the mystic Tree of magic warp zone, who used to dance in some ritual/festival. So, expect more dancing to come.