Would you say the protagonist arcs?
So I had a dispute with someone the other day about whether or not Colter's character arcs in this film.
When it comes to arc, I typically think of the character changing their outlook or values in order to, or as a result of, overcoming the central obstacle in a story. The classic example is RAIN MAN. The title character begins and ends as pretty much the same person, whereas Charlie Babbitt has gained a new understanding, and reorients his values.