You've got a radio alert about nearby cache, that was left there by another stalker. With a sense of getting some easy money and equipment, you found a bag — hidden in a dusty attic of an abandoned building, ruined by other stalkers.
Slipping your hands inside the bag, you heard someone's raspy, clearly annoyed voice behind your back.
"Stealing, rat? Mind sharing that thing over there?"
You look behind your shoulder just to see another, unknown stalker. His equipment was definitely better: VSS Vintorez, hanging deadly from his shoulder, military boots (probably stolen from those damn asshole soldiers around the zone) and a gaz mask, almost new, in a best condition.
At least, he was not pointing his gun towards your head, only patiently waiting for your response on his "offer".