" Wyatt Earp is my friend. " Doc's simple but powerful justification for his loyalty.
If you are looking for an interesting subtitle or tagline for the movie (1993), the most iconic piece is Doc Holliday’s legendary line, " I’m your huckleberry ". In the 1800s, this southern idiom meant "I’m the man for the job" or "I'm exactly who you’re looking for". Memorable Options from the Film subtitle Tombstone
For a more "cosmopolitan" or intellectual subtitle, you could use a piece of the Latin duel between Doc and Ringo: In vino veritas ("In wine there is truth"). In pace requiescat ("Rest in peace"). " Wyatt Earp is my friend