(2) Third-Party Defendant’s Claims and Defenses. The person served with the summons and third-party complaint — the "third-party defendant":
(B) must assert any counterclaim against the third-party plaintiff under Rule 13(a), and may assert any counterclaim against the third-party plaintiff under Rule 13(b) or any crossclaim against another third-party defendant under Rule 13(g);
(C) may assert against the plaintiff any defense that the third-party plaintiff has to the plaintiff’s claim; and
(D) may also assert against the plaintiff any claim arising out of the transaction or occurrence that is the subject matter of the plaintiff’s claim against the third-party plaintiff.
(4) Motion to Strike, Sever, or Try Separately. Any party may move to strike the third-party claim, to sever it, or to try it separately.
(5) Third-Party Defendant’s Claim Against a Nonparty. A third-party defendant may proceed under this rule against a nonparty who is or may be liable to the third-party defendant for all or part of any claim against it.
(6) Third-Party Complaint In Rem. If it is within the admiralty or maritime jurisdiction, a third-party complaint may be in rem. In that event, a reference in this rule to the "summons" includes the warrant of arrest, and a reference to the defendant or third-party plaintiff includes, when appropriate, a person who asserts a right under Supplemental Rule C(6)(a)(i) in the property arrested.
(c) ADMIRALTY OR MARITIME CLAIM.
(2) Defending Against a Demand for Judgment for the Plaintiff. The third-party plaintiff may demand judgment in the plaintiff’s favor against the third-party defendant. In that event, the third-party defendant must defend under Rule 12 against the plaintiff’s claim as well as the third-party plaintiff’s claim; and the action proceeds as if the plaintiff had sued both the third-party defendant and the third-party plaintiff.
US Supreme Court // ©
(As amended Dec. 27, 1946, eff. Mar. 19, 1948; Jan. 21, 1963, eff. July 1, 1963; Feb. 28, 1966, eff. July 1, 1966; Mar. 2, 1987, eff. Aug. 1, 1987; Apr. 17, 2000, eff. Dec. 1, 2000; Apr. 12, 2006, eff. Dec. 1, 2006; Apr. 30, 2007, eff. Dec. 1, 2007; Mar. 26, 2009, eff. Dec. 1, 2009.)