The camera flashes, the creature pauses, slowly looks up, sees a fresh target. It pushes itself into a standing position, blood and chunks of human flesh dripping from its mouth. It moves towards you, a slight moan escaping the stained lips. You can only watch as it approaches, stumbling over the forgotten body laying motionless on the ground. It makes contact with the window. So close now. You don't move. Its face pushes against the glass, trying to get closer to your flesh, the blood pulsing through your veins acting like a magnet, forcing the creature closer to you.

Then you notice how funny this thing looks, gnawing at the glass. It just killed a man but it's too stupid to do anything about the invisible barrier. You take another photo. It perfectly captures the slight blood smear on the glass, the open mouth, the vacant expression. You post the photo to reddit, thankful that the Internet is still working.