More on AI; Watch
this clip from Blim Blim at Gamersryde--at the 3:30 mark watch the Helghast. One fires at you, backs up slowly, then turns on his heel and heads for cover, another Helghast (offscreen) heads into frame and climbs up a set of stairs towards cover.
At the the 3:53 mark, the remaining Helghast throws a grenade in the player's direction, exposing himself, returns to cover for a moment, then promptly leans out from cover, ready to target you.
That's inherently logical decision making; the grenade wasnt thrown accurately, so the player didnt need to move to escape the blast radius, but had the grenade not missed its mark, the AI would have correctly anticipated the player's movements.
3:53 AI throws grenade.
3:53 AI anticipates timed delay of the detonation, returns to cover.
3:54 AI waits in cover
3:55 AI leans from cover,anticipating the player's movement away from the presumed blast radius.