is one piece episode 616 filler?

Luffy continues his fight with Caesar Clown after punching him and leaving a deep imprint on his face. Caesar then tries again to flaunt his protection under Doflamingo in order to intimidate Luffy, and immedately attacks Luffy with an attack called Gastille which is recoginsed by one of the subordinates who states that it is capable of melting steel, but Luffy dodges it and delivers another punch to Caesar's face.