Amid the Jaegerists' military coup, Eren speaks with Mikasa, Armin, and Gabi, the warrior candidate from Liberio. During the conversation, he tells Mikasa that her Ackermann blood is what compelled her to fight on the day they met, and continue to protect him since.
During the conversation, Armin attempts to fight Eren, only to be stopped immediately by Mikasa. She lets him so, where he once again attempts to fight Eren. Eren wins, telling Armin that they've never fought before because it wouldn't be a fair fight. He then captures and imprisons both of them.