In the scene when Jack is dangling from the cliff, Matthew Fox performs the stunt himself, as he considered that relying on stunt doubles "always sort of inhibits the director's ability to shoot it in cool ways."[1] Fox dangled from a thirty foot high cliff in front of a blue screen, that through digital extensions appeared to be hundreds of feet high. However, Fox's long time stunt actor, Steve Blalock, performed Jack's rolling down the mountain before grabbing the edge of the cliff, given Fox considered that "there are some things that I'm not gonna be able to do".[4]