is one piece episode 394 filler?

The Rosy Life Riders arrive. Sanji gets straight to business and tells them that a mermaid was kidnapped.

Franky asks them for help in the search for the kidnappers. Usopp, Franky and Sanji get on the flying fishes and they set off.

Duval says that they will pick up the Straw Hat Pirates while tracking down the slave traders. Chopper is pacing up and down, thinking of Sanji's instructions and the separation of the Straw Hats.

When he sees Brook sipping tea calmly, he is shocked and berates him, reminding him of Camie's fate if she is sold. Brook calms Chopper down.