In Darren Shan's book "Slaughter," the narrative delves into themes of survival and the harsh realities of life. The characters are often faced with grim choices, highlighting the struggle between personal desire to help and the inevitable limitations of their capabilities. This dynamic creates a sense of urgency and despair, emphasizing that not every life can be saved.

The quote "You can't save everyone. It's not an option" encapsulates this sentiment perfectly. It serves as a poignant reminder that despite our best intentions and efforts, there are circumstances beyond our control. This realization shapes the characters' journeys, forcing them to confront their own limitations and the harsh truths of their world.