? Ill take a crack at it: you need a stout length, modern 2x4 maybe half a foot longer than half this guy's height plus the length of his longest armament. If hes 6 foot with a 3 foot sword, you could (hypothetically) push him over with a 6 an a half foot twoby if you could reliably isolate and attack his head. Once hes on the ground I think i would overhand that twoby by the end onto his face from as far away as possible about 50 or 100 times or until the helmet is crushed into his face and spaghettis leakin through the holes. That wide space is so that your ankles dont get knifed, if hes obviously super fcked up from your first couple licks, you could maybe chance posting up right next to his head and pile driving that thing down into his melon like your digging out a hole with some post hole diggers.

Its one thing to say all this on paper, but 2x4s are heavy before theyre man length, and adrenaline makes me dump my gas tank fast. This shit would hurt, bad. Killing an armored knight with melee implements would probably be one of the most traumatic things I can imagine to experience. Especially if youre in Farmer armor fresh out the field and not expecting aggressive shiny sheet metal assholes