is attack on titan (shingeki no kyojin) episode 6 filler?

After witnessing the deaths of his Squad 34, which included Thomas Wagner, Nack Tierce, Milieus Zeremski, Mina Carolina, and his best friend Eren Jaeger, Armin comes out of a state of shock to find Conny Springer shaking him. After snapping out of his trance, Conny asks Armin what happened to the rest of his group.

Christa's friend states that they were obviously wiped out and criticizes him for being a coward as only he escaped death. Conny is about to fight her, but Christa breaks them up and attempts to calm everyone down.