I believe they were walked to the guillotine and told to kneel at the head of it. They would then be executed while people watched. It was brutal in that time.
Faith seems quite lonesome and sad, wishing for her loved husband to stay with her. And Goodman Brown seems very devoted to wherever he is going, and assures his wife she doesn't need to doubt him for he would be back soon. I hope this helps!
He committed treason.
I hope I helped:)
Please leave thanks:)