Bad Guys in Black are Overconfident

I finally remembered why the scene where Anakin lost to Obi-One in the last Star Wars episode was so familiar to me. It is very similar to the fight, actually not much of a fight, between King Arthur and the Black Knight in the "Monty Python and the Holy Grail" movie. There, the Black Knight (like Vader) keeps fighting even as he loses his limbs. Is it that bad guys in black don't know when to give up? The cool black look makes them overconfident?

I've searched the web and found the scene. It may refresh your memory.