To the mortal viewer, it appears that the two men simply float across from each other, staring! But on another plane of reality, Doctor Strange and Baron Mordo duke it out in a battle for the ages! A battle that Strange is evidently winning, because my animation skills are lacking! Looks like the Baron shoulda brought Dormammu along! It's the ultimate magical ghost, four-frame, Night's-13-color-pallete-using, contest enty conflict in... ASTRAL PROJECTION!
Best viewed zoomed in.