being that the case more on my favor, if a fat guy just came out of an office with a chunk of sharpened, poorly balanced, bad steel blade and cuts two pigs in half with a single swing, then a fully trained warrior with a good quality sword... get my point?
Anyway, beyond the point of legend and truth about greatsword or katanas (BTW those were just examples, noone is saying anything about best weapon or whatever, in fact i don't like katanas either, more bastard sword fan actually) I'm saying that you don't need to cut a man in half to kill him, if you swing a sharp blade the size of a greatsword it will cause damage to whoever it hits, so it is possible to have multiple npc injured with one hit, even kill them, we were, after all talking about immersion breaking by that particular subject, and I belive it does not.
And physics are really simple in these case, you get cut, it hurts, you bleed, maybe you survive (BIG scar) maybe you die on the floor. period.