In "Try to Change the Past" by Fritz Leiber, a man prevents his future self from being shot in the forehead only to see that future self killed by a micrometeorite puncturing his forehead exactly when the bullet would have. Poul Anderson presents this idea of inertia of events in "Time Patrol" but not on that unlikely a basis. In the Time Patrol universe, that man would have saved his future self. I have read little of Leiber's Time War series and have not liked the little that I have read. Too many ideas unrelated to time travel, and also insufficiently explained, are introduced. The time travel happens almost off-stage and the causality violations are not described coherently. I think that the narrator suddenly has a scar that she didn't have before (or something like that) but I am not about to try to dig out The Big Time to check the text.
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