The 172nd One Piece episode pits Chopper against the priest Gedatsu, whose absent-minded blundering turns a deadly trial into a winnable fight, while Robin clashes with the Divine Soldiers' leader Yama among the Shandora ruins.
Deep in the upper ruins, Robin pores over an ancient monument and learns the buried city was once named Shandra. She keeps recording her findings, hopeful they will lead toward the True History she could not trace on the seas below, until Yama, who insists he commands the Divine Soldiers rather than serving God's Army, confronts her. Nearby, Chopper finds himself facing Gedatsu, a priest so scatterbrained that he forgets to point his eyes at his target and neglects to speak aloud. Gedatsu announces his Ordeal of Swamp, admitting his own clumsiness has bumped the survival odds from five percent up to fifty.
Floating on a Milky Dial, Gedatsu hurls a Numagumo Burger that clings and drags its victim deeper the harder they struggle, but the cloud strikes one of his own soldiers instead. Chopper rescues the trapped man, only for Gedatsu to finish the soldier off with a Jet Punch. After biting a Rumble Ball and switching to Jumping Point to dodge, Chopper notices the priest's vulnerable feet, snatches away a shoe, and counters in the air with an Arm Point cross strike. Gedatsu plunges into the swamp, and his own Milky Dial drives him under for good. Elsewhere, Yama smashes through the ruins to attack Robin, and Luffy remains lost inside his strange cave.
The episode draws on chapters 261 through 263. During the duel, the anime gives Arm Point Chopper reindeer hooves for feet, whereas the manga depicts them as human feet. Aisa, adrift after a Sky Shark devours half her boat, is saved by Conis and Pagaya, and she presses them to bring her to Upper Yard so she can reach the Straw Hats.
Yes, Chopper defeats the priest Gedatsu in Episode 172. After biting a Rumble Ball and switching to Jumping Point, Chopper spots Gedatsu's vulnerable feet, steals a shoe, and lands an Arm Point cross strike that sends the priest plunging into the swamp.
Chopper overcomes the Ordeal of Swamp, though Gedatsu's own clumsiness plays a part; his Milky Dial ends up dragging him under the swamp for good after Chopper's counterattack.
Chopper's fight against the priest Gedatsu takes place in Episode 172, Ordeal of Swamp! Chopper vs Priest Gedatsu!!, part of the Skypiea Arc.
Gedatsu is so scatterbrained that he forgets to point his eyes at his target and neglects to speak aloud, and his carelessness even causes his Numagumo Burger attack to strike one of his own soldiers instead of Chopper.
While examining an ancient monument in the upper ruins, Robin learns the buried city was once named Shandra, and she keeps recording her findings in hopes of tracing the True History.
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