A Little Help?

Hey guys, I'm slightly confused and need your help. So we know that the Man in Black cannot kill the candidates, when Sawyer pulled the wire, it didn't count as the Man in Black killing them, Sawyer basically killed them. (Hopefully I'm making sense here) But in "Dr. Linus", Richard is unable to kill himself as Jack proves when the dynamite's fuse goes out before it explodes. Can you guys please explain this to me, I'm pretty confused :)

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