Horror games: Which horror game enemy is most adaptive in haunting the player?

[Kross]

Have you played an horror game and the AI enemy is just adapting to your every move to haunt you? Those enemies are not scripted, but are very smart that you have to dig deep to outsmart it. Which horror game enemy is the most adaptive that you have ever come against? For me, the Aliens in Alien Isolation wins it. What if you?

 

[lens]

Resident evil 3 Nemesis is an ideal example of a tense game. I can't seem to forget the tension and fear it creates, making it a very memorable gaming experience.