You see that there is another creature on the roof, something even sacrier than the first. The shadows seem to draw back around a creature that seems to be letahlity incarnate. Black bone like blades cover its Forearms Shoulders, and Knees. Bone frame wings support a thin membrane  and green glowing eyes stare at you from a face that can't be desribed. Shadows seem the wrap and writh about its form concealing then revealing parts of it as if the shadows were alive... and its fighting the one that attacked you.