How did Patrick kill Alice Ruber?
Poirot comments that the same pattern of events that occurred on the island also occurred on the moors when Alice Ruber's strangled body was discovered -- i.e. an innocent witness, a change of time. How did the change of time play out on the moors? This is never clearly explained. If you notice, when the lonely hiker runs into the police station in the beginning to report the discovery of a body lying out on the moors, the clock in the police station reads something like 5:30. When the police arrive at the scene, they estimate the time of death to be about 4:00. We're told that Felix Ruber had a "cast iron alibi" that had been corroborated by an innocent witness who had found the body earlier in the day. I don't see how this provided Redfern with a cast iron alibi. Did anyone figure this out?
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