"Yes, I did."
"Did you think the horse was the Doctor's own?"
"I own, I did."
"Did you ask him if the horse was his?"
"No, I did not. I concluded it was so."
"Did you see the horse sold?"
"I did."
"Who do you consider sold the horse?
"I considered, to my great surprise, that Doctor Gambado sold the horse."
"Then you altered your opinion of the Doctor."