Final answer:
Antony's second sentence surprises the audience by showing him openly flaunting social norms with his behavior, which was deeply shocking in his leadership role.
Step-by-step explanation:
Antony's second sentence might surprise the audience because it goes against conventional expectations Antony, the powerful Roman leader and Julius Caesar's representative, was expected to adhere to social norms, but instead, he openly paraded with an actress, Cytheris, in socially inappropriate settings like military camps. This behavior, as discussed by Cicero in the Philippics and Plutarch's Life of Antony, was deeply shocking because it flouted societal norms. Cicero uses this incident to criticize Antony's moral integrity and leadership, drawing the attention of his contemporaries and history readers on Antony's professional and personal misconduct.