It is silent, when it is active, the area around it except for itself will be desaturated, it prevents the next room from being opened, and attacks from the front, if you leave your hiding spot it will aim to you, if you are hiding it will resume backwards through the room, it comes from the front, it emits almost no sound, if you are not fully hidden when it attacks you, it will kill you anyway, once it passes, it will often teleport back to the door, making the faint sound of wind, and pass by a few more times, before eventually despawning. Upon despawning the wind sound will be slightly more prominent