is one piece episode 16 filler?

The children escort Kaya through the forest as they hide from Jango, and Zoro and Usopp attempt to locate the group. However, Kaya falls ill and is no longer able to run.

The children attempt to ambush him with a fake surrender, their weapons and a falling log, but this attempt fails as Jango is unharmed by the attacks. After Jango threatens to kill the children, Kaya agrees to sign the will as planned, and in exchange the children would be spared.

However, before Jango is able to kill Kaya, Zoro and Usopp finally locate her and arrive to aid her.