I think the type of helmet will make the difference.
For example a sallet or barbute will give a better chance for the attacker to give the helmet wearer a concussion (and it is easier to whiplash the head as well)
An armet with wrapper a great helm (with a bassinet under) or a great bassinet will make the knock out much much less likely.
But a 15th century helmet that fit and is appropriately padded will reduce the knock out chance greatly any way.
About the murderstike (the halfswording one, not the wretling ones). Ringeck tells us to do it to the hands and the knee. And from what I understand he says he does not seem to hold it in great value. (but Talhoffer seems to like it a lot).
Cutting through mail has always puzzled me, from what I have been able to gather. It seems that mail was not harden/quenched before the 13th century.
I think it is possible to cut through a mild steel riveted mail even possibly mild steel helm, with an AT 1515 I have cut nails holding the cabbage from horse back (no damage to the sword nor what it especially difficult)
Up to the 13th century, high quality blades were not that common. The 13th century seems to be the time where good quality sword seems to become more available.
I am relatively confident that blade like the Sutton hoo blade would be able to do the same as the AT but more common blade like the low end “Viking” sword would be more challenged by the task.
What do you think?
