is one piece episode 704 filler?

Under attack from Donquixote Doflamingo's string clone and a Parasite-controlled Bellamy, Luffy blocks the string clone's Goshikito with a Armament Haki-covered leg before being sent flying into a wall by a slash from Bellamy, only to get up and note the attack did not cut the strings binding his hands. Hearing a rumble from above, Luffy realizes Law is in trouble and decides to not remain any longer.