The judge might 'disqualify' [='bar'] her 'from' serving on the jury.
(..) The recruit who does best will win the honor of killing his first dragon in front of the entire village. Hiccup already killed a Night Fury, so does that disqualify him? Can I transfer to the class with the cool Vikings? Don't worry. You're small and weak... that'll make you less of a target. (..)2010 How to Train Your Dragon