Oh wow. Miss bumpkin was pretty short-lived and didn't live up to the serial killer cannibal hype, which leaves the mystery of the abandoned village and the massacres just outside unsolved. IF she really was just a country bumpkin, then the "twist" is no twist, but that also means she's pretty much a wasted character who was only introduced for the shock value of her sudden death.
Maybe this will also add to the guilt of the protagonist now that his actions led to the deaths of both brother and sister. As the master of the slave who murdered her, I can see him thinking he shares responsibility, even if he didn't intend to kill the girl.
With this outcome I also assume miss slave executed the defeated knight offscreen (if it wasn't that "snap" inducing kick she gave him last time). Slave executed the defeated knight with a neck-breaking kick, I missed that gnarly broken neck on page 2 of the previous chapter. So ends the abandoned village arc with not much changing, except adding 2 more lives taken to the slave's body count.