The motion of the crowd has moved Ibani just far enough away from him that he's not covered by her mental shields.

Nomar Organa looks displeased to see him stepping forward for a moment, before the expression vanishes again into something neutral. He makes a hand gesture that Garyn will have seen Ibani use before exactly once, on Athiss. "You will stand aside, I have business with your Lady."

A mind trick is a subtle thing, but Garyn is stubborn and he knows far more about what someone else in his head feels like than any other non Force sensitive alive.