A shadowy figure

Passing it by as just a simple noise that does not concern you, you continue walking past the building. You are about halfway home when you realize that something isn't right. All of the noises of the night are completely silent. Out of the corner of your eye, you see something moving once again. The only difference, is that you can actually make out what it is this time. A shadowy figure lurks in the darkness, and you can just make out two eyes.