Quote Originally Posted by thegreatonemal View Post
You're trying to blend game play elements with the lore and they don't always mix in this case they probably don't. The device throws off her echo and when the effects wear off it reactivates. The cast bar is just a gameplay thing telling you to hit her again with the thing.
Yes and no. The game does tell you, around the time you meet your starter city scion and they solve the mystery you have the echo, that you can see telegraphs because of the echo.