Being that this is the Arkham series I don't think it's beyond the pale that this would have been something of an homage. One can see influences from the comics, the animated series, the Burton films and especially in the latest one the Nolan films. Given that the game depicts the Batman's first meeting with the Joker it's quite possible that played in their minds (or not, I just don't think it's inconceivable...). I thought of the movie as well when that happened. Even involved helicopters.