See also beta 539, beta 540, beta 542.
[1] Connected by Bernhardy with Homer, Odyssey 9.219, where the headword appears. There it is indeed an unaugmented epic imperfect, third person plural, equivalent to e)/briqon; but in the illustrative example offered here -- see next note -- it is a present participle in the neuter nominative/accusative singular.
[2] Quotation (transmitted, in Adler's view, via the Excerpta Constantini Porphyrogeniti) unidentifiable.