This dream may symbolize feelings of vulnerability and fear in your relationship with your fiance. The middle of the night setting suggests a sense of darkness and uncertainty. The fact that your fiance is naked could represent a lack of protection or vulnerability in the relationship. The door symbolizes a barrier or boundary, and the sound at the door could represent a potential threat or challenge to your relationship. The tall figure with a bird doctor mask and knife could represent a sense of danger or harm, and the fact that your fiance is able to get out of the way and find a gun could symbolize a sense of empowerment or protection in the face of this threat. Your hiding in the bathroom and peeping into the hallway could represent a desire to distance yourself from the situation and observe from a safe place. Overall, this dream may reflect underlying fears or insecurities in your relationship and a need for protection and security.