Black Visitor Kills me in neighbor's house

In my dream, I went to pick up my mother at her friend's house. My mother's friend is restricted to a wheel chair and she has diabetes. A man in a grey suit walked thru the door. My mother's friend said "Oh no, No no", and scooted her wheelchair back to her room. I couldn't see his face, but when he came thru the door and got closer into the room between my mother's friend (Virginia), he went from 6' tall to 12' tall and 4' wide and fluid black, like a cloud. I stepped between him and her and pulled out a sword and tried to slash thru it. I heard the sword hit the ground and all I saw was pitch black after that. That's where the dream ended. What could this mean? Tweet