The fighting form Mustaba shown is actually the Brazilian martial art Capoeira. Many of the people performing it are, in fact, longtime practitioners of the art, and are even shown wearing the proper uniform and corded belt consistent with the art.
K'tano refers to "The System Lord Nirrti". Although Nirrti has previously been shown to be a System Lord, she wasn't present at Summit (2001) which was supposed to be a conference between all of them.