The plaintiff may assert any claim against the third-party defendant who thereupon may assert his defenses, counterclaims and cross-claims, as provided in Rules 12 and 13. A third-party defendant may proceed under this rule against any person not a party to the action who is or may be liable to him for all or part of the claim made in the action against the third-party defendant.
Ind. R. Civ. P. 14