DUEL IN LATIN
Doc Holliday: "In vino veritas." ("In wine truth.")
Johnny Ringo: "Age quod agis." ("Do what you are doing", or "Attend to the work you have at hand.")
Doc Holliday: "Credat Judaeus Sotella(?) non ego." ("Only the credulous believe it." "Non ego." means "Not I.")
Johnny Ringo: "Eventis sultorum magister." ("Experience is the teacher of fools.")
Doc Holliday: "Pace requiescata." ("Rest in peace", I think, however "pace" means "by leave of" and "requiescata" probably has something to do with death.)