, the bartender and the man sitting next to the gringo must be one honest and swindlecant.
. the bartender must have said: "Yes, I speak the truth"
the man sitting next to gringo said: "The bartender said yes, but he is a big liar.",
if it's true - the man is an honestant and the bartender a swindlecant,
if it's false = bartender is an honestant and the man is a swindlecant.
swindlecant means a person who is cheating other.