Anyone who knew Angus well would probably know he was holding his temper.  The butcher intimated that he could work in his butcher shop to pay off the debt.  What nerve!  And he was lying, telling him he made a nonsensical bet and owed him 20 quid.  What really was intolerable was bringing up Ruth Blacke and asking him if he was still married to her.  Angus had no clue, but he wanted to forget about Ruth, he didn't want to be reminded of her.  Because of that, he realized he probably couldn't walk into this place again.  And this was the only one where he knew nobody heard of her.  Well up to now.  He stood up and looked the butcher in his eye.

"If ye really think I owe you money,"  Angus said to the guy.  "I think you need to talk to my atternees, the Finger Law Firm."  He balled his right hand into a fist and threw a punch at the left side of the other man's mouth.  "They're managed by Thumb."  He laughed at his joke and prepared for a fight with the man.