It doesn't have to be big drama. If the flood is going to happen anyway he just needs a minor hindrance to stop him going with the main party and then by the time the floods clear he may feel inclined to get permission to stay for whatever reason. Even that he feels he would be more useful there than at Edoras. But don't have the flood just for his sake...
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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