is demon slayer: kimetsu no yaiba episode 14 filler?

After a desperate fight to the death, Tanjiro prevails over Kyogai. He steps out of the mansion to find Zenitsu, who’d escaped before him.

But then, he encounters an unforeseen circumstance before him: the battered Zenitsu, holding the box containing Nezuko in his arms, while the man wearing a boar hide stands in the way with two Nichirin swords drawn…