This might sound fanciful, but anyone who's played STALKER knows the unexpected goodness its Al can conjure - this event can and will happen to the fortunate as they play. One is mere feet from your hiding place when, suddenly, an almost invisible creature leaps 10 feet in the air from the growth opposite, grabs the bandit before again leaping away into the rushes to feast on its prey.
And there you are, crouching in the windswept reeds, taking cover from a military helicopter sweeping overhead, when you spot a bandit patrol coming straight towards you down one of the bog's many narrow gullies - their brains powered by an updated version of STALKER'S astounding A-Life system. It's a huge boggy mess, flooded long ago by a Soviet government far more interested in hydroelectricity than land management. The Sun Is setting on the vast, open marshland that constitutes Clear Sky's opening stages.