u/BeepBeepLettuce3

Strelok, Scar, Degtyarev, and Skif all possess the anomalous ability to see the many possible directions their future can take them, allowing them to choosethe future in which they continue to live/are successful. This is how you can savescum and replay the games, and how the player characters make it for so long in a business as dangerous as stalking.

I know that obviously the reason you can quicksave is because its a video game, but this is what I choose to believe.