A struggle culminates in Macduff's confrontation with Macbeth, who kills Youthful Siward in combat. The Rebel forces overwhelm his army and castle. Macbeth features that he has no rationale to worry Macduff, for he can not be killed by any gentleman born of woman. Macduff declares that he was "from his mother's womb / Untimely ripp'd" (V.kala kalia