Catching Corinthians by Guile?

QUESTION: Did St. Paul do right when he "caught the Corinthians by guile, being crafty"? See II Cor. 12:16.

ANSWER: His enemies slanderously said that he preached for money, not asking for it directly, but making Titus a cat's-paw to procure money for him craftily, while he was pretending to preach without burdening the people with the contribution box. Paul repeats their charge in order to refute it. All obscurity would have been avoided if he had written "They say," "I caught you," etc., as in 10:10.

— Steele's Answers, p. 169.