Angel (1999) - 5x06 - The Cautionary Tale of Numero Cinco

As Angel finds himself losing faith in the Shanshu prophecy, a brutal Aztec warrior begins cutting out the hearts of heroes. Angel gets down to the bottom of the mystery by consulting with Number Five, an old man who, together with his brothers, killed the warrior the first time around. However, Angel finds that Number Five has since lost the thrill of battle after Tezcatcatl killed his other brothers, who did everything together. Angel must find out how Tezcatcatl came back once more, and help Number Five see the hero inside himself.