is one piece episode 3 filler?

Luffy returns the katana to Zoro, who uses them to free himself and repel the Marines' attacks. He agrees to join Luffy's crew should he survive.

Despite being clearly overpowered by Luffy's Devil Fruit power and Zoro's Three Sword Style, Morgan orders his men to attack them. Morgan himself joins the battle, with his right hand being replaced by an axe blade.

Despite Luffy overpowering Morgan, Helmeppo holds Koby hostage, threatening to shoot him. Meanwhile, as Luffy is distracted, Morgan attempts to attack him from behind.