An Unexpected Kinjutsu!! (まさかの禁術!!, Masaka no Kinjutsu!!) is chapter 510 of the original Naruto manga.
Madara Uchiha falls into the chasm, and Konan continuously detonates exploding tags for ten minutes. Madara survives, and states that he used Izanagi to escape from her attack. After Madara explains how Izanagi works, Konan tries to kill him. Her attack is interrupted by Madara, and he uses a genjutsu to force her to reveal the location of Nagato's corpse. Madara arrives at the shrine where Nagato is hidden, and states that Nagato is the "third of the six paths" and a member of the Uzumaki clan.