Are their mouths open when They shout? If so, they aren't particularly authentic Chinese. If their teeth are clinched and they're shouting "Bill Gates is the Messiah" (which, with clinched teeth, would sound like "IILLL ATTESSSSHHH IISS UUHHH MUUHHHSSHHIUH") then they're probably good Chinese practioners. Hell my sifu calls forms katas, but he's pretty **** traditional