Actually I think Link could beat the Witch King. Ok in the movie they got this " I'm no man thing" which is not in the book so I wont refer to that but Gandalf scares the Nazguls and the King with light. That means he was scared for light, mabey because it could hurt him. Links lightarrows, at least if you play wind waker, kills every evil being in one shot except Ganondorf and the bosses, anyone else. So mabey he couldent kill the Witch King but the Witch King couldent kill him either cause he would be scared or Link would be invisible.