In this moment, Bruno finds himself in a dark room after a chaotic situation, yet he remains firmly connected to Shmuel by holding her hand. Despite everything happening around him, his grip symbolizes a strong bond and loyalty to her, even in the midst of confusion and danger.
And then the room was dark and somehow, despite the followed chaos, Bruno realized that he was still holding Shmuel's hand between his own and nothing in the world would have convinced him to release her.
This highlights Bruno's unwavering friendship and the innocence that persists despite the surrounding chaos of the world they are in. It emphasizes the emotional connection that sustains him even in dark times.