Cornered by Superman, Wonder Woman, and Batman, it seems that Harley Quinn ... calls Harley Quinn by the name "Cassandra" while she's dressed as Batgirl, Harley then uses this knowledge by calling ...

And Batman! And Robin ... because he's trying to court Portia. Who is dressed like Superman? Portia, as she is disguised as a lawyer representing Antonio in court. It does make some sense because ...