Luke looked at this guy thinking a few things. First the guy was not afraid to buy more and more drinks even though he was pretty drunk. That either meant he was rather confident in his own ability to hold his liquor or he was a complete idiot. However that was not an obstacle to stop Luke as much as it was another challenge. The second thing was that he took pride in being a gunslinger. A gunslinger who saw no danger in getting as drunk as he possible could. This guy must be a complete idiot. All it would take is for Luke to pocket one of his pistols and sprint away. Then it would guaranteed that Luke who was not a trained shot could probably out shoot this guy in  gun fight. "I'm Luke, nice to meet you my friend." He told the man.