system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why didn't the Cantina attendants react that much to a jedi-looking old man who cut off another man's arm off with a lightsaber?
gpt
It's a hive of scum and villainy.  Someone getting dismembered by an energy weapon is a fairly regular occurrence.  Similarly, someone getting shot by a smuggler in one of the booths is also nothing to raise eyebrows over.  

Unless you're asking why they didn't react to the Jedi specifically, well it's possible none of them knew what a Jedi is, or what a Jedi would look like.