is one piece episode 503 filler?

The Celestial Dragon, Saint Jalmack, shoots Sabo's ship again, destroying it, much to the shock of all the citizens watching. Meanwhile, Luffy and the mountain bandits worry about Ace and Dadan, who were trapped in the Gray Terminal with Bluejam.

Soon after both Dadan and Ace return, making Luffy and the other bandits happy. Ace tells everybody that after they managed somehow to defeat Bluejam, they could not return as the fire became too powerful.

Dadan ran through the fire making a path for her and Ace to escape but she was severely burnt because of it.