>>40384135Indeed, there are few rare conditions where they can temporarily lose control.
Generally speaking, however, demons are in total control of their cover's emotions if in cover, because they're effectively controlling it like an MMO character. If you pick the wrong emote to display, your cover displays the wrong emote. It didn't matter that you are extremely angry: you are "elsewhere", a different quantum state piloting the cover that just gave a nice warm smile.
The "Miles Away" dramatic failure effect is a control loss in this fashion, and a demon in true form isn't hiding behind a cover and probably has its (likely very hostile) emotions normally detectable - although it may require a bit of interpretation depending on what it looks like.
Pic related: You can just see the deep loving stare on this one's face.