"before it had to move" = "before it was necessary for it to move"
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contrapositionThey didn't know what happened to the other people on their trip.Who are 'their'?Also, 'their boat' and 'their vantage point'. 'their' is the possessive of 'they', and there's nothing in the quoted passage that specifies who 'they' are, so it's not possible to say which group of people 'their' refers to either. Presumably the tex