Alan walks up to his door camera with Maria following right behind him, nervous, feeling that Alan might overreact after he sees Amon.
Being okay with her finding another man attractive is one thing, but seeing the man she finds attractive and knowing how leagues above this man she is compared to him is different.
Alan might start feeling jealous, his pride might get injured, and it could lead to their relationship getting sour. Maria doesn't want that to happen.
She is nervous. She tries to stop Alan, but then stops. Maria hesitated. She doesn't know why, but she did, and Alan was already before the camera's screen.
He goes into the storage and starts rewinding today's footage, and he soon comes across it.
Alan sees a tall, muscular man walk past their door. The man even looks at the camera, making his face very visible. It's as if the man intentionally showed his face to the camera.