Norman was originally a scientific researcher, and he will work with Jack's dead brother, a scientist, to implement the Avatar project. From the beginning of the film, he was very disdainful of Jack (although he didn't say it clearly, he could see it from Jack's words). In the bridge you mentioned, Jack's monologue said, "Norman's attitude towards me has obviously changed. But he also called me scum (idiot). Norman taught Jack to speak Na Wei, so as to better integrate into the tribes in Na Wei. I C U is a greeting when people meet in Na Wei. In the film, you can see many later scenes showing that the heroine used this sentence when she met Tai Su and her father. In fact, Cameron is reflecting the Indians (because Indian tribes say hello like this). This meaning does not refer to general vision, but to people's psychological ability.