I am writing a story from a 3rd person perspective as the omniscient narrator. When my antagonist is revealed first, people believe him to be a certain person - X, not that any one says that to him or confirms with him but they believe it amongst themselves. This is a major plot point in the novel and serves a major twist later on. I would like to make my readers believe that he in fact is X and not Y.
Writing this is well and good from other character's POV but when I'm writing from the antagonist's POV, I find it hard. In fact, even introducing him at beginning of the chapter presents a difficulty. I'm trying to retain the illusion when writing from the antagonist's POV, what are some of the tips that you can suggest ?
E.g. - A cool wind blew, ruffling his hair as he moved forward towards his destination. The target had eluded him, for so long but finally, vengeance was his, X of the elvish clan. He was the foremost of the Forsworn and he would not be denied his revenge.