From chapter 5 of the manga version of 我が驍勇にふるえよ天地. It shows the pillaging of a village as exposition for a group of bandits. The innocent girl selling flowers raises a blade to them when they take her so they decide to torture her and take bets on how long until the break the tough act she put on at first.

It's darker because the last thing the older couple say to her before the bandits attack is to never forget how to smile like she does when selling flowers and you later see that couple dead as she remembers their last words. While her death isn't explicitly shown you see the aftermath of her decapitated and mutilated head.

Also I didn't add the censorship it is part of the manga.