People differ in anthropometry, level of training. There are many types of armor, as well… But all the differences become nullified by a halberd strike aimed at person’s head. Of course, there are men who can withstand a hail of blows, but here the question arises – “are they human beings at all”? In general, if a few head blows delivered with two-handed weapon are not enough to win, then blows aimed at legs will finish any fighter. As for a fighter with shield and sword, he/she has to fight very hard to bring the opponent down (unless the level of opponents differs a lot).