Quote Originally Posted by Sennin Jinchuuriki View Post
Are you talking about Sasuke? But he awakened his Sharingan during his battle against Haku that's why he was able to see Haku when he was moving so fast and later on it was confirmed when he battled Lee. I agree that emotional trauma or stress is needed for awakening the Sharingan but age I guess is also a factor. Anyway he didn't awakened the Sharingan at the night of the massacre if that was the case he would have used it against Kakashi when fighting him for the survival training.
he actually unlocked it, it was because he was so young that he had not completely figured out to unlock it personally. thats why he didnt use it against kakashi