Ansah went on to play a minor role as one of the Shadow Warriors in Batman Begins (2005). However, his most noteworthy role to date came in 2007, when he appeared in The Bourne Ultimatum as Desh Bouksani, an Assassin tracking down Jason Bourne. Ansah's performance was notable for an extended set-piece fight scene between himself and Matt Damon, regarded by one reviewer as one of the best ever filmed, in which Ansah performed all of his own Stunts. In 2008 he was nominated for an MTV Film Award in the "Best Fight" category.