Which detail from paragraph 26 supports the idea that the paw has disturbing and sinister effects on all who possess it?

To accurately answer your question, I would need to know the specific text or context of paragraph 26 you're referring to. However, generally, a detail that highlights negative consequences or unsettling experiences faced by previous owners of the paw would effectively support the idea of its disturbing and sinister effects. Look for descriptions of fear, regret, or tragic outcomes associated with its use to illustrate this point.