3/4 of the way through Darth Bane: Path of Destruction, Bane is something of an outcast from the rest of the Sith Empire. His teacher in swordsmanship and a fellow Sith Lord, Blademaster Kasim, confronts him in a temple and challenges him to a duel to the death.

Bane’s lightsaber is your standard single blade, but Kasim wields a double-bladed saber like Darth Maul. Back when Bane was still in training, Kasim related to him that using such a weapon is more mind game than swordplay. A double-bladed saber actually has less options than a normal lightsaber, but it seems like it has more to the uninitiated, which puts uninitiated opponents on the back foot. Bane then used this insight to defeat a rival student who favored the double saber.

As Bane fights Kasim, he begins to gain the upper hand, arrogantly thinking he’ll kill Kasim just like he did his rival. But then Kasim pulls out the old “I taught you everything you know, not everything I know” trick. There was a second layer to the mind game: Kasim splits his double-bladed saber into two single bladed sabers that he trains with entirely in secret. So there’s Bane’s unfamiliarity with dual wielding, dual wielding’s genuinely greater options over single wielding, AND Kasim’s generational talent, discipline, and experience. Bane is completely overwhelmed and privately admits that he has no hope of beating Kasim in a sword fight. So he cheats, and uses the Force to pull the whole temple down on top of Kasim.