Eren’s character arc in Season 1 is a descent into the monstrous. The revelation that he is a Titan shifter (episode 9) does not empower him; it alienates him. He is chained, interrogated, and nearly executed by his own kind (episode 13—likely your file’s reference point, where the military court debates his fate). The episode 13 trial is crucial: Eren’s rage is validated by Commander Pixis as useful, but only if contained. This containment is a second wall—social and institutional. Eren becomes a tool of the very system he despises.