Dream About Shooting In Large Mall

I was in a large mall with my mother and little brother. i remember walking around and i bumped into this girl that didnt like me , it was random but me, my mother and little brother moved on. Me and my brother where on the 3rd floor, my mother was on the second. Suddenly a shooter was shooting everyone. It was a black man wearing a black hat and black clothing. I somehow had a gun so i aimed it at him. I shot the gun 3 times. i remained calm and shot the gun. I missed my first shot, i hit him in the head with the second, He kept trying to get up so i shot him again. After, i laid on the floor crying scared for my family. And i looked up to see a girl i was fond of a sittting down a few feet away from me, she didnt acknowledge me on the floor.