Frequent, brutal scenes of Muay Thai boxing, including knockouts and scenes where participants cough up blood.
A prisoner is set upon by executioners, and it is implied he is beaten to death; we do not actually see the carnage, but do hear this via an intercom broadcast to his fellow prisoners.
A man is compelled to beat two men in exchange for drugs; while we hear the blows, the worst we see is some blood on his neck.
A man is tattooed by his fellow prisoners; we see blood trickling down his back.
A man coughs up blood several times, and we hear in an exchange with a doctor examining him that any trauma near his stomach can potentially kill him.
A prisoner pumps out some of his blood into a needle and threatens another prisoner with it, as he states he is infected with AIDS.
A man bites a prison guard in the neck after he is refused painkillers; we see the bite in slow motion, followed by blood trickling down his face.