User blog comment:Trulyrandom/Lets add some science to our articles/@comment-2253300-20120915104153/@comment-3258762-20120915165821

I fail to see your weight class logic. Obviously they have rules. The reason is so the bigger one won't punch the smaller one and knock him out. As for the fighting naturally: You can have all the skill in the world if you so wish, you won't beat someone who hits like a train. Take Krav Maga and Aikido, where you use your opponents weight and momentum against him. They, as anything less than a knife, fail horrendously if the opponent you face is bigger and stronger. You can have all the deflecting skills in the world and it won't mean anything if your opponent breaks your arm in one punch.

Look at Orks and Space Marines. The Space Marines are seldom foolish enough to engage an Ork their size in single combat without first trying to disorientate it, with, say, shooting it with a bolter. You can take the book Rynn's World for example: Alessio Cortez (dubbed The Immortal), probably second only in fighting power to Pedro Kantor, went up against an Ork Warboss and lost. Horrendously. He didn't die because a Devastator gave his life to save him, but he lost his arm. This is a guy over 300 years old fighting an Ork probably only 20.