Rule of thumb is anything that doesn't leave bruising or welts. Slapping and light choking and hair pulling, spitting, etc can be mild/lite rough play within specified boundaries. I've done that kinda stuff by request, even though it's not really my bag.
Closed fist punching anywhere on the body is definitely well beyond accepted rough play. Even if she gave consent for that kind of violence, Bauer should have had the common sense to not go that far when he is a well-known public figure. Seems extremely reckless.
Still, the possibility remains in my mind that she requested the former, faked the latter, and is now using vague text messages as ammo for a payday.