Aragorn didn't have to "use" Osanwë to intimidate the Mouth, just as any strong person doesn't have to use supernatural skills to intimidate a weaker person. The Mouth of Sauron was perceptive, he had to be to scale the hierarchial ladder like that. At first glance, and shielded by his arrogance and close-mindedness, Aragorn just seemed like another petty king leading a group of "mindless rabble" with a "piece of elvish glass." But with a closer look, the Mouth realized that this was no ordinary person he was messing with.
There is a big, physical difference between a strong, steady person and a weak, vacillating person. You can tell straight off the bat, who is strong and who is weak. Even an Orc could have realized that Aragorn wasn't a man to be trifled with.
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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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