Look carefully this video. Here you can find the comparison of movements of Piper System (demonstration of Nigel E. February) and Genoese work technique with the knife (demonstration of professor Antonio Merendoni). Obviously that movements are the same. But as you understand Genoeses and Venice techniques is much more ancient than Piper System!
So the African criminal tradition has Norman roots. And this is a historical fact! Any person who tries to say the opposite is an idiot or a con man. Nigel, you can choose!