as changing the name of his finisher to "La Painkiller". At Summer Attitude 2010, Rivera defeated World Wrestling Entertainment employee Bryan Danielson, then IWA Puerto Rico Heavyweight Champion and first contender to the WWE United States Championship, by pinfall following his finishing move. Later that night, he sanctioned a contest for the belt between his brother and Danielson, which was won by the younger Rivera. Rivera then entered a feud with Álvarez, who had served as special referee at Summer Attitude 2010 and made his in-ring debut in the IWA, winning the contest between them. Rivera went on to win two more matches over midcard talent before entering a lengthy hiatus. Returning in winter, he confronted "The Academy", a group that had entered the IWA two months earlier that was harassing Pérez. At Christmas in PR 2010, Rivera wrestled and lost to one of The Academy's members, the debuting Chris Angel for the vacant Intercontinental Championship. A rematch was scheduled for Histeria Boricua 2011, which was promoted with a throwback angle in which he emphasized how having defeated other undefeated wrestlers such as Austin and Johnson, claiming that his loss at Christmas in PR was nothing but a fluke. Regardless of this, Angel won the rematch and eventually went on to become an undefeated world champion. Upon exiting the ring following the loss, Pérez confronted Rivera and told him not to return until he had "returned to his roots". Total Nonstop Action Wrestling (2008–2009) In July 2008, Rivera began working as a road agent for Total Nonstop Action Wrestling. In January 2009, he became head agent for the promotion's women's division, known as the TNA Knockouts. He also served as the unofficial trainer for the division during this tenure. On July 31, 2009, Rivera was released from his contract. Return to TNA (2011-2012) Ring Ka King (2011–2012) In late 2011, Rivera was rehired by TNA, this time to work with Ring Ka King, a TNA affiliate promotion in India. Along with Jeff Jarrett and Dutch Mantell, he was responsible for training the Indian wrestlers at Ohio Valley Wrestling, TNA's developmental territory in Louisville, Kentucky. International promotions (2007–2013) While wrestling in the IWA, he competed in Revolution X-treme Wrestling based in Panama, performing in a battle royal to determine the winner of the vacant RXW World Heavyweight Championship, where he won the event. In January 2008, he began an international tour.