Your enemy's motions are directly based upon your own. You can't change your own moves and expect his to remain the same.
Just by trying a different move in one spot you totally change where the bad guy would end up, how hard he would pull, how he would be able to get a guns lock on you faster, etc.
From the technical side of things, the film viewer has no flight model in it. It's purely graphics game itself. You don't have anything to "jump into" -- as opposed to some other games where film viewers are integrated into playback, but these all (to my knowledge) only do that with AI partners. None do it with human players on the other side.