You don’t know where it started, but ever since Eren heard of the outside of the walls calling Eldians “Island Devils”. He began acting irrationally at various moments. No longer smiled and wasn’t interested in anything. needed a close eye to be kept on him at all times. He wasn’t excited today either, despite finally being outside the walls and across the sea. he snuck away, talked to a kid, and got drunk with a few other survey corps members. Now, he seemed relaxed. And even smiled.