Lol all these Desticles saying guardians. They're just standard dudes with space magic, as far as we can tell they're not even trained. Spartans are genetically modified supersoldiers in armor that is at least the strength of a tank, with shielding as well. It's like trying to kill a fallen walker that can run at 30mph and outthink you. Guardians get wrecked-- a dozen guardians could probably air a spartan though, just a spray a few clips at him and spam supers. At least half would probably still die.