I think that what could have happened was once the Elves saw Haldir, their leader, fall, they figured that they too could sacrifice themselves so that the Rohirrim could escape. That would have covered everything except for the fact that I have distinctly seen at least a couple of Elves run into that "back room" after Aragorn, right after the Uruk-Hai burst in through the doors.
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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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