How does Wemmick treat the butcher? What happens to Wemmick’s mood and personality as he and Pip walk home?

Wemmick fills Pip in on the butcher during their walk home. Wemmick talks about how he had been a juror in the butcher's trial and is somehow responsible for the butcher being free. Wemmick gets a chicken out of the Wemmick's little walk down memory lane. Wemmick's little story made him sound rather intimidating but his disposition seems calmer as they near his house.