DarkFootage_0_o

This security camera footage has been sitting on the internet for years. Nobody paid attention. Until someone noticed the mirror. A girl was dancing alone in the studio. She stopped to rest. Sat down with her back to the mirror. But the reflection didn't show her back. It was staring straight at the back of her head. Then it stood up. Full height. On its own. The girl never noticed. She was looking the other way the entire time. She had no idea. Something was standing behind her in that mirror. And it never looked away. What do you think was standing in that mirror?