If your friend had the dream then your friend should be the one to interpret their dream. Have them write down what they remember from it. Sights, sounds, smells, taste etc. What in the dream bothered them or what really stood out.
They can then go about looking up the symbolizes for the dream. Although, every dream means different things to different people. If the interpretation of the dream doesn't sound right to you then try on your own to figure it out.
Just shy away from the idea that every dream interpretation is black and white.