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not be surprised if it occasionally appeared in these circumstances.
Definitely much rarer than the corresponding pattern of the young Franklin's Gulls.

9.  Freeze.  Like the young Franklin's Gulls.

10.  Squat.  Like the young Franklin's Gulls.

11.  Head-bobbing.  Takes the place of Bowing in Franklin's Gulls.  Obviously homologous in some sense, but quite different in physical form.  Very similar, in physical form, to the Head-bobbing of adult of all species.  From Erect to Hunched.  No trace of real Low Oblique.

12.  Ruffles.  Presents the same problem as the Ruffle of the young Franklin's Gulls.  Can probably be explained along the same lines.