Doc Holliday ALWAYS keeps his promises... Even the really ridiculous ones.
Thomas Jury is still mad at Doc for disappearing when he was fae; and according to Andrew’s rules, that entitles Jury to beat on Doc until he feels better. But since Doc is Doc and Jury doesn't really stand a chance, Jury devises a solution that will kick Doc’s ass even more than Jervis could. Leprechaun gold, water from the Fountain of Youth, etc... The list of obscure items that Jury wants as repayment are handpicked to make Doc miserable, and Jury knows that Doc is honor bound to go through hell and back to deliver or die trying...