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Pete's death in "Father's Day" wasn't a fixed point in time but it was an established event in Rose's own past. When Rose saved his life, it didn't create a collapsing timeline (as happened in "The Wedding of River Song", when a fixed point was altered) but caused only a "wound" in the timeline because of the paradox. The paradox was that Rose was there only because Pete had died &, when she saved him, she removed the cause of her own presence.