This is something that was not a part of Warband. As soon as we were receiving damage, as small as the amount of damage was, our swing was cancelled. On Bannerlord, sometimes you are in an encounter with someone, you straight up outplay the person by hitting him FIRST, and their swing keeps going so they hit you as well... I don't see any reason why this should be a thing, it undervalues the importance of skill versus armor.