Ending

I've been trying to make sense of the story told in S:CS and S:SoC.

In SoC you play as Strelok and eventaully make your way to Yantar, where you do some science for a scientist so he can give you the prototype Psi helmet.

In the prequel, your character follows Strelok during his fateful trip into Chernobyl where Strelok gets captured. This leads to the story wrap-up at the end of CS where we discover that your character is the reason Strelok got captured and set up the events told in SoC. So Clear Sky wraps up nicely and sets up SoC.


During Clear Sky, however, the scientist at Yantar tells you that he gave Strelok the protoype helmet. But later in SoC, we do measurements for the scientist so he could complete the helmet. So what's the deal? Did Strelok help complete the helmet twice, once in Clear Sky when being tailed by Scar, and once in SoC when played by the character?