is attack on titan (shingeki no kyojin) episode 7 filler?

As Titans continue ravaging Trost, the cadets in charge of supplying gas are seen begging Captain Woermann not to leave the HQ. Without proper manpower, any Titan attack would cut off soldiers on the front from resupplying runs and leave everyone vulnerable.

While Woermann says that he must leave to oversee the organization of reinforcements, the cadets imply that he simply wishes to go to the safety beyond the inner gate. He grows angry at their implications and silences them under threat of treason.