If he got to Sirion after their attack, he wouldn't have to confront them. As one of the last scions of Finwë, it would have been his "duty" to try and protect his people. He probably didn't realize that Sirion would be attacked. Naturally, afterwards, he would shift there in case future attacks occurred.
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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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