If you get hit by a arrow or hit by a sword. While riding on a horse.
I think you should fall of the horse. but only SOMETIMES, would be more realistic
And if I run you over with my warhorse, you should get insta-killed.
And bows can't pierce plate, nor can swords, picks should get stuck in plate after 1-hit.
If you go down realism path, everyone would be a plated 2h with a mace on horseback, as nothing else would be able to kill a plated man