is one piece episode 437 filler?

With Luffy defeated, Magellan orders the guards to throw Luffy to the central tower on Level 5. He also learns that someone is causing a disturbance at the stairwell Hannyabal is guarding.

On Level 5, some of the prisoners are suffering from frostbite. Some want to warm up at the Burning Hell.

The prisoners spot Luffy being carried through the yard on a wagon and see how effective the poison is. Magellan spots the downed guards and chokes Hannyabal demanding an explanation.

The vice-warden explains he was caught off guard. He also says some ballerina-martial artists fought through him.