Everything Went Dark

You look into the mirror again. You still see your surroundings. but now you see someone else. At first, they were a blurry and shadowy figure. And as you looked closer, you could see the person. You know who it is.

...do you, though?

I mean you must, you're the one looking in the mirror after all.

You chose the mirror.

Who is it?

You tell me.

I'm not the one who is staring into the mirror.