The Legend of Korra Episode 1.03 The Revelation

In order to collect enough money to pay off their pro-bending fees, Bolin joins the Triple Threat Triads for an upcoming turf war and disappears. Mako and Korra, concerned with Bolin's safety, search for him at the Triad base, only to find it ransacked by Equalists and all the Triad members, Bolin included, abducted. The two follow the kidnapped Bolin to an Equalist event, where Amon shows off his ability to permanently take away bending. Korra and Mako manage to rescue Bolin, and Amon decides to let them go so they can spread word of his power. Korra returns to Air Temple Island and tells Tenzin the events of the Equalist event, which causes him to fear the anti-bending revolution even more.