This is Oac 997. Otherwise known as the Stalker. This creature is quite odd, as it will pick 5 random people that it has seen, and make them its target. How you can tell if you're its next target is if you can see its face. Otherwise, you will not see a face. There have been rare instances where 15 people all saw the face at the same time before the face disappeared, and also cases where people saw the face but were never killed.
It does not appear fast until it is. oof.
