I think the reason PJ split up the storylines like that was, if he had stuck to the way it was done in the book, the audience would have had no sense of time. This way, we know what event happened when, and what the other characters were doing while an event was happening. In any case, you can't deny that it also created quite a bit of suspense! Right in the middle of the Battle for Helm's Deep, the scene switches to Entmoot, and so on.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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