In "Against a Dark Background" by Iain M. Banks, a character expresses a cynical view about another's potential usefulness. The speaker implies that while someone might appear to have value, in reality, their contributions are far from beneficial, likening them to an injury that serves no productive purpose.
This quote highlights a theme of skepticism about perceived utility in relationships or alliances. It suggests that sometimes we might be surrounded by individuals who, like a broken leg, only hinder rather than help, casting doubt on the notion that every person can be of use in challenging circumstances.