is one piece episode 549 filler?

Luffy and Jinbe start their duel to see who gets to fight Hody, and as Luffy tries to leave, Jinbe attacks him with his Fish-Man Karate, hurting Luffy. Nami wonders how it hurt him since he's a rubber man and Jinbe explains the mechanics behind Fish-Man Karate.

As Luffy activates Gear Second and the two are about to clash, Robin interferes and as Sanji tries to save her, she disappears and Luffy, Jinbe, and Sanji all hit each other while the real Robin comes out of the forest revealing she's learned how to make clones of herself.