Walden says he didn't mean to bump umpire Bruce Stritesky late in the first half. Instead, Walden says he was trying to move around Stritesky so he could hear and see which Bengals player was talking to him.
Walden acknowledged he was surprised when the flag came out. He also showed reporters the letter he received from NFL Commissioner Roger Goodell.
Indianapolis (5-2), which led 10-0 at the time, beat Cincinnati 27-0 for its fifth consecutive victory.
AP NFL websites: www.pro32.ap.org and www.twitter.com/AP-NFL