Chamon Weaves — WHC Passive 'Killing Shot' Function

I am currently on weave 77 which is a metal weave. Light attacks do not seem to instantly kill man-sized targets that are also armoured (like Stormvermin). Is this intended?
I have heard that it makes normal armour super armour. Is this true? If so, could it be the cause of killing shot not instantly killing?
I understand if this is intended behavior. I have posted this in the Fatshark Lounge because I do not know if it is a bug or not.