is attack on titan (shingeki no kyojin) episode 78 filler?

Eren Jaeger limps his Attack Titan towards his brother Zeke's fallen Beast Titan, but is interrupted by a bite to the leg from Porco Galliard's Jaw Titan. He smashes the Jaw Titan's head and back before his Titan's arm is blown off by an artillery shell shot by Theo Magath.

Before Magath can shoot again, Floch Forster and his squad attack the Cart Titan and its artillery crew. On the ground, Paradis Island's military spreads to avoid taking the Marleyan forces head-on.

Armin Arlelt suggests to his friends that they sneak around behind their enemies.