Originally posted by Leo Daher
As far as I know, these are made-up systems with no historical basis in fact. Being born and raised in Brazil, with a lifelong interest in the martial arts, I can assure you there are no organized, native knife fighting systems in that country (though there was a time, many decades ago, when some Capoeira practitioners were known to resort to edged weapons - particularly straight razors - during street brawls).
After doing a search on the Internet, I found out that Testa is a karate instructor in Brazil. Apparently, he made up those "ancient native systems" (not one or two, but three different ones, hence his three-tape series) in an attempt to cash in on recent interest in knife combatives. To paraphrase the Romans, Caveat Emptor (let the buyer beware).