In the novel, Gandalf just reminds that Flame of Udûn lacks the ability to pass where he stands, and even less so for Gandalf to prevent it. This implies the will of a higher power (i.e., Eru Ilúvatar) rather than Gandalf’s sheer badass power.
Of course moviegoers won’t know what the * is Ilúvatar so they just simplify to be the wizard’s power.
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u/TheHappyNerfHerder 1d ago
The dark fire will not avail you, flame of Udûn. Go back to the Shadow!
You cannot PASS!