Ask Peter Jackson. I don't think this belongs to "The Books"-section. The Movies actually have nothing to do with Tolkien, they are only based on his books. Sorry, but I think this is a stupid question.
(The only mention of Gandalf using his sword while battling the Balrog is that he used it to defend from the Balrog's sword)
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"Out of doubt, out of dark to the day's rising I came singing in the sun, sword unsheathing. To hope's end I rode and to heart's breaking: Now for wrath, now for ruin and a red nightfall!"
~Eomer
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