Harry's screaming about his arm, Tyrone's screaming about his friend, all with distorted sounds over the shouts. It makes for a traumatizing scene where both the male character's addiction problems are coming to a head. Meanwhile, Sara is being forced by doctors to have ETC, which is also horrific and hopefully not a real life example of how ETC actually works. It's Scary Because: drug addiction isn't necessarily limited to Class As, but can be found in medication users too. This bit compares the fates of both heroin users and those who get addicted to diet pills, and they're not all that different.