I've recently started reaching the x-files and there's one thing in the season 8 finale that I don't quite get. Spoiler alert if you haven't watched that yet, though.

There is a scene where Mulder wants to drive out with his car and is then stopped by Alex Krycek with a gun who demands that he gets out of the car and explains that Mulder is still alive because of him but now he has to kill him because "he wouldn't let it go". Skinner at this point shoots Krycek saving Mulder and after that Krycek also says that Skinner has to shoot Mulder and that 1 bullet will give a thousand lives.

What does he mean by that? Why does Krycek suddenly think that he has to kill Mulder?

I've recently started reaching the X-Files and there's one thing in the season 8 finale that I don't quite get. Spoiler alert if you haven't watched that yet, though.

There is a scene where Mulder wants to drive out with his car and is then stopped by Alex Krycek with a gun who demands that he gets out of the car and explains that Mulder is still alive because of him but now he has to kill him because "he wouldn't let it go". Skinner at this point shoots Krycek saving Mulder and after that Krycek also says that Skinner has to shoot Mulder and that 1 bullet will give a thousand lives.

What does he mean by that? Why does Krycek suddenly think that he has to kill Mulder?