After what just happened, Victor still cannot forgive himself. He crouched in the room, locked himself in, decided to be alone.
He didn't want it, but the events of that day were repeated in his eyes. The way he, at the time, without any guilt, was even happy because it was his final job to officially escape from Bennet's grip, shooting the man repeatedly. Unaware that the man is the father of the girl he care too much now.
Plus, when he saw Irene's face that had been shattered in front of him. For that reason, Victor blames himself, many times over for what already happened.
"Victor! Open this damn door!"
Ken's voice was heard from the outside of the bedroom door, shouting at him. In fact, he is already trying many times, to interact with his friend before, but he thought Victor might need some time to sort things out, but his guess was totally wrong. Victor is too engrossed with his guilt feeling.