Why did Sasha shoot one of the Bubblegum Gang boys?
Because they were beating on Beth. Stuart paid big money for Beth, and Elite Hunting wanted to be sure she was kept in perfect condition. Had Beth gotten beaten up, her price would have gone down.The children were also going after Beth for money, without Sasha's permission. So for their punishment, he made an example out of one of them. He lined them up, saying to Slovak, "Get away, this one's mine." Sasha went down the line, looking at them one by one, as if to say "Who's it gonna be?" The kids know one of their own must die, so they sacrifice their friend. The boys turn against him and throw him to Sasha, who shoots him.
Sasha exchanges looks with the leader, as if to say, "Now we're even."The kids walk away, staring, knowing one day they'll get their revenge. And they do. At the end of the film The Bubblegum Gang helps Beth to kill Axelle.
She is captured on the lakeside and hanged upside down, naked, in a room that has a sort of ancient bathtub sitting in the center. Another naked woman sits underneath Lorna, and begins to slice her open with a scythe, causing her blood to shower down on the woman. After a few minutes, the woman uses another, smaller scythe to slash Lorna's throat. The scene is a reference to Countess Bathory, who was reputed to have bathed in the blood of her victims.
Beth tricks Stuart into wanting to have sex. It is then she is able to attack Stuart and tie him the the chair and forces Stuart to reveal the numbered code to open the door; the code is her birthday: 1212. Elite's staff responds and rushes into the room to find her holding a pair of scissors at Stuart's groin, threatening to cut off his genitalia. She then says that she wants to buy her way out -- she'd inherited a fortune from her mother's death and she has the money to offer them. After she learns that it's not all about the money and that no one can leave without killing, she cuts Stuart's genitalia off after he calls her a "stupid cunt" and feeds it to the dogs. She fulfills Elite's contract by leaving Stuart to bleed to death and is tattooed with the symbol of the bloodhound.We then see the Bubblegum Gang steal Axelle's purse to lead her into the woods where she's tripped by a rope, a trap set by the kids. She then sees a woman in a cloak which is revealed to be.....Beth! Beth beheads Axelle. The Bubblegum Gang play soccer with Axelle's head.