I was thinking that, people think they develop a function because they are in environment where that function is used a lot.
If someone is in a Law environment for example and they see a lot of Te users, they could think that their rise in assertiveness and whatever traits they develop from the job are a result of growing Te. But I think that is a misconception about shadows and that it is more likely their Ti is growing.
I see using a shadow like temporarily shifting your political stance from liberal socialism to fascism or something. (I know nothing about politics so I chose the most crude contrast