BR running backwards

[yorkboy33]

I had a situation this weekend at a tournament where the B bunted the ball down the first base line. The pitched fielded the ball in fair territory and proceeded to tag BR out. BR stopped running and started to run backwards toward home plate. I was working the bases and noticed my partner was not making a call so I called him out. Later on my partner told me it was the wrong call. I was always told that a BR cannot run backwards between home and first, however, I could not find a rule to backup my claim. The only rule I found that was close to it was at the end of the base running section that stated a "runner cannot run in reverse order to confuse the opponent or make a mockery of the game." Any help would be greatly appreciated.