@Cao the Exiled I don't think so, other than just appearing by the cart it's up to you.
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Regardless of what that typo might have you think, no, Jub's perception is nowhere near good enough to hear people's expressions changing, especially over an applauding crowd.
His Wisdom has no bonus, he is not proficient in Perception. Even if it was possible to hear someone gaping, Jub would not be capable of doing such a thing,