I've recently resumed writing a series of scripts for an anime I've been planning. One of the characters has the ability to shape-shift, and there are several scenes in which she initially appears disguised as another character, before shape-shifting back into her normal self.
So far, when writing these scenes, I've referred to the character using the name of the person she's disguised as, and only switched back to her real name after she transforms back again. However, the top answers to these questions suggest that I shouldn't do that; scripts are production documents, and it's imperative that the crew know exactly who's supposed to be in each scene, hence I should always refer to characters by their real names.
But in the case of a character who's disguised as another character, how do I do this while also making it clear that they're pretending to be someone else right now?