Wait, Who Plays Captain America in the Hulk?

If Marvel still hasn't officially casted Captain America for The First Avenger movie, then who plays Captain America in the scene from the Hulk? We know that the scene where the Hulk meets Captain America has been cut from the final edit, but who portrayed him. Or was he just a figure hidden in the shadows of a cave? If we see a different actor in The Incredible Hulk than in The First Avenger, then that ruins continuity. Just a thought.