In duels and such on mods like Wushu, running can really decide if you win or not, I wouldn't expect anyone to abide by the "Fair-Play" rule when doing this, since the aim of a duel is to win right?
But for Casual games in Wushu I think "Fair-Play" should always be the idea, trying to get CBs etc, But i suppose If your not gonna Play Fair, then don't expect your opponent to.