Some games, like GTA, allow you to wreak havoc, and it is fun to do. But it is essentially totally silly and laugeable.
Fully implementing a realistic system how the world reacts to you going rogue is not nearly as easy as it sounds, but assume we’d put that system in place, whilst sticking to what is real an plausible.
one option is, that you piss off the lord of the land, and he sics his men at arms at you. And his servants, hired swords and game keepers, huntsmen and the guys with the hounds for hunting.
You can be fulla armoured and on horseback, but you can’t survive -THAT-. uh uh. nope. no chance.
Or the lord doesn’t give a fuck, but the population knows you.
You pay for a night at the inn, the innkeep, whos brothers wife you recently raped and murdered, according to a plan hatched at the last village meeting, gathers the rest of the town folk, and you are surprised in your sleep, with nothing but your shirt on. beaten, cut, strangled, maimed cut to pieces, broken, torn apart and burnt.
the idea of one man taking on a whole army is largely fictional.
Or say, you are known to be a mad and vicious killer…you enter a village, and the 12-15 villagers flock together. with pitchforks, clubs and knives.
Sure, from horseback you cut down one to the right of you…and the guy to your left cant kill you with his pitchfork. but by pushing it into you, whilst you are busy hacking to pieces the first guy, gets of off balance, someone grabs your sword arm, some milkmaid grabs your horses reigns… you’re pulled down your horse and fall down, and you better hope you die quickly, because that dozen angry peasants doesn’t like you.