is attack on titan (shingeki no kyojin) episode 10 filler?

Inside the Walls, the soldiers are put on stand by. One of them, Daz, tells Marco that he is unable to fight anymore, as his comrades were devoured right in front of him while he was just happy not to end up like them.

However, knowing that he might be the next one to die, he takes out his sword in an attempt to end everything, but Marco stops him. In an attempt to calm him down, he points out Sasha and her struggles, but she screams in agony, complaining of a stomach ache, and asking to go to the infirmary.