Er...wouldn't throwing the pommel of your sword away make the sword a lot harder to use, because now it's unbalanced?
This is an actual technique described in multiple historical manuscripts. The flavor text is a slightly-paraphrased translation of the direct quote from the Vienna Gladiatoria manuscript. A more complete translation would be something along the lines of:
“Note the twelfth play. If you want to end him quickly, hold your spear and sword together on your arm, unscrew the pommel of your sword and throw it at him vigorously. Close in with the throw and use your sword or spear, whatever suits you best.”
The manual in question was specifically about tournament fighting and dueling, not military technique, so the technique, which sounds completely absurd out of context, was meant for use in a one-on-one fight, where both opponents were outfitted in full plate armor, a sword, probably a buckler, and a spear. That’s why in my mock 4e power referencing it, you need to be using a sword and a spear. You can imagine how, in this context, your opponent suddenly throwing their sword pommel at you might catch you off-guard, just enough to buy them a moment to rush in and “end you quickly.” In this context, it doesn’t really matter that having the pommel removed from your sword would unbalance it (not to mention making the grip liable to fall off the tang), nor that unscrewing the pommel of the sword would take for ever, because the whole point of the technique is to use it right as the fight starts to distract your opponent, and take advantage of the distraction by bum rushing them. In theory, they should be dead or eliminated from the duel pretty much right then and there.
Also, a true hard-core rules lawyer would look at the name "End Him Rightly" and say that, as shown by the very name of the ability, females are immune.....
“End him rightly” is a mistranslation of “ob du wilt reschlich mit ym entten,” which as Garthanos pointed out would be more accurately translated as “if you want to finish him fast.” This particular mistranslation was made famous in 2014 by HEMA Youtuber Skallagrim when he made a video making fun of how impractical the technique seems on the surface, and it became something of a meme. I intentionally used his exact mistranslation for the name of my mock 4e power because, well, that was kind of the whole joke.