CG, were you shown how to break para cord with the back of a Wilkie knife.
Was also once shown how to do it by friction!
[Needs 4 hands] 2 hands hold the cord taut, other 2 loop another bit of cord twice over it and pull both ends - left right left right like a bodging lathe - and miraculously it breaks/burns/melts.
(conscious the description is not good, but I know what I mean!)