Unmarked spoilers are ahead, per Spoilers Off rule.
Shion calling out in vain to his mother as the police car he's being held in passes by her.
Throughout episode 10, Shion begins to shed his Pollyanna status and become more hard-hearted, no longer crumbling at the deaths around him. Nezumi displays a veritable laundry list of heartbreaking expressions as he realizes this...ending in a full fledged breakdown when Shion coldly shoots a guard.
You better believe there wasn't a dry eye in the house when Shion is shot in the final episode. Nezumi is so distraught that he literally crawls to Shion's body. After he covers him with his jacket, he lays down next to him and waits for the building to come down.
