To what extent can a plaintiff bring new claims against a third-party defendant joined through impleader?

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Impleader brings in a third-party defendant who may be liable to the defendant for all or part of the plaintiff’s claim. When the plaintiff adds new claims against that third-party defendant, those claims must arise out of the same transaction or occurrence as the plaintiff’s original claim. This keeps the dispute tied to the same set of facts—focusing on how the same event produced liability among the parties—rather than opening the door to unrelated, standalone claims. Because of that limit, the plaintiff can pursue new claims against the third-party defendant only if they are connected to the same event. Choices suggesting any independent or all-encompassing unrelated claims aren’t allowed.