In this scene, Bertholdt sees his friend and accomplice breakdown infront if everyone after losing his sanity in their escapades from within the walls. He feels remorse, regret, fearful, and completely and totally anxious to whats to happen. After reiner declares their true identities, they are attacked by Mikasa who slices Bertholdt's throat, leaving him in tears and anguish, rolling in the floor gasping for breath, before he ultimately transforms.