If you’re interested, this is a translation of everything John has said.

“Nine thousand pounds? Are you having a laugh? (Are you kidding me) “You’re Rin right? I didn’t think you would be a Chinaman (basically anyone from the ‘Orient’ was referred to as a Chinaman in Victorian Britain, though at this time period they also probably would have been exclusively Chinese.) “Still, nothing else for it, we’re going to have a fight you and me. I’m not doing time (jail time) if you want to chuck me in jail you’ve got to catch me policeman.”

“So what’s it going to be?”

Then:

“Hey, you’re the one pulling out a sword mate.” “I haven’t done anything, so I have nothing to reconsider.” “But like I said, if you want to chuck me in the nick (jail) you had better come and get me.”

Though I'm aware you probably know what he said for the most part, and it's just your character that is confused.