The troll. First sweep with the mace will break that shiny sword. Then a bear hug will break the knight like cracking a lobster claw. Those spikes on the troll's cheat ought to penetrate even the platemail, but the lower spikes will certainly pierce the vitals. Give the knight a few minutes to bleed to death if he doesn't die from the crushed ribs into his lungs or the broken back or the troll's bad breath. The only way for the knight to win against a bigger opponent is to use ranged weapons accurately, use pole arms, or to dodge behind and hamstring the monster. A troll on the ground is semi-helpless. However, hamstringing and backstabbing isn't very chivalric, and I doubt if the knight can move quickly enough. As to the comment above about the weight of real weapons, in many cases they were much lighter than we'd expect. Decades ago there was an exhibit from Spain at a museum in San Diego.. a entire table of 6 foot swords like in El Cid... I reached out and grabbed one by the handle and lifted it a few inches, just to check the weight, then set it carefully and precisely down. I looked up to see museum guards converging on me from all sides. They didn't expect a jr high school girl to be THAT interested in weaponry. It was embarrassing. Carolly the Curious