Miura: "Guts? Casca? Griffith!? Fuck that, what my readers want is a Schierke and Isidro chapter focused on mischievous panty-flashing, they will love it!"
Editor: "But Miura sensei, What if... just what if people are not reading this manga to see a bunch of brats fooling around in their underwear?"
Miura: "well in that case i can have the mermaid girl appear naked! you don't have to force my hand i was gonna do it anyways."
Editor: "No, that's not what i meant... what if they want something like, i don't know, plot progression? violent action? maybe some dark fantasy?"
Miura: "Children underwear and fooling around tho!"
Editor: "Yeah, but the story..."
Miura: "Fineeeeee, i will have the old fart mage ask Guts about what he is doing with his life, and after Guts says that he is ok living on the island killing time, i will have the ghost of his son appear."
Editor: "Thank's Miura-sense-"
Miura: "And he will be naked of course!"
Editor: "As long as the whole chapter is not just filler, you do you Miura-sensei"
And as a result only most of the chapter ended being just filler.