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The idea is that if the bridge spans 50 feet, and a chasm is by definition "narrow" (longer than it is across), then the chasm must be more than 50 feet long and thus the room is more than 50 feet wide. If the Balrog's wings were literal, then they literally stretched the entire width of the room ("width" being the space that is perpendicular to the bridge's span), making his wingspan greater than 50 feet.
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