It is coming for you... and it will never stop.
The red eyed demon will randomly move towards you in big steps. It can also teleport around. But if it moves too much, it will need to rest. Its eyes will turn blue and it will become visible. Once it is rested, it will disappear again and chase you. The map is a 3*3 grid, and it will move to your grid spot if you aren't in his grid spot.