i really liked the terminator idea and then that lead onto another idea.
MATRIX!
*all players are on one co-op team and have to do an objective and get out via 1 or 2 specific phones, while the AI controls the agents.
*The agents will have the ability to "take over" any npc civilian or cop like in the movie.
*Slomo FX could be used similar to the ardenel pill but i think that would get anoying if someone does it over and over.
*Agents should not appear on the radar unless in close proximity to the player. adding to the fear factor, you dont know he's there till its almost too late.
*modify gravity for players and agents only so they can do the whole jump building to building thing while normal npc's / vechiles / cops cant.
i dunno, what does everyone think? the main problem i see with it is having npc's spawned all over the map could caus latency issues.