Alright then, why doesn't he return those $10 that he owes if it's worthless to get into fight over it? If the guy who can't get his money back is this upset and ready to fight over it means that those $10 are worth more to him than to you and maybe this guy was holding the money for too long and didn't mean to give them back ever and it just came to the breaking point. I once beat up a guy cause he didn't want to give me back just 200 Serbian dinars(about $2) that I gave him cause I felt that I would be a weak fool if someone could screw me over any amount of money that I borrowed. Yeah I could have taken the high ground and just say "take tose 200 dinars and showe it up your ass" and just forget it, but I would still be a fool that got screwed over by someone. I had to hold my ground and he and others respected me afterwards and than they knew not to mess around with me.