This dream may symbolize feelings of betrayal and danger in your waking life. The warehouse represents a place of work or a project that you have recently completed. Your colleague’s sense of someone coming may represent a sense of impending danger or a feeling of being watched. The stranger who suddenly appears and kills your colleague may represent a person or situation in your life that you feel is a threat to you or your work. Your colleague’s preparation and use of a gun may symbolize your own defensive instincts and readiness to protect yourself. The fact that you are able to kill the stranger may suggest that you have the ability to overcome challenges and protect yourself in difficult situations. This dream may also reflect feelings of guilt or regret for not being able to save your colleague. It is possible that you are facing a difficult decision or situation in your waking life where you feel like you have to choose between protecting yourself and protecting someone else. Overall, this dream may be a reflection of your fears and anxieties about betrayal and survival in your waking life.