Chie insists that saving people in danger is her thing. I'd contend that dancing is her thing. She sure does a lot of dancing and not a lot of saving people in this trailer. Well, unless handing out unsolicited motivational advice and threats of "rocking your faces with my Kung-Fu dance" saves people now.
This move bustin' isn't anything new for Japanese folks, as they've had Persona 4: Dancing All Night for more than a month now. Everyone in North America has to play wallflower for a bit; they aren't allowed to cut a rug until September 29.