Scene during the concert [Spoilers]

I don't know if you noticed but during the concert while Bobby and Marie are dancing+kissing, we can see different things.
First, at the beginning of the dance+kiss, the image of the symbol of the group (A skull) alternates quickly with the couple then every second we can see a gloomy/blured face.
If you play the movie frame-by-frame, you can see that this face is Marie's face with blood on her face and shirt.

It's a clear indication (such as the beginning of the movie : the transition from Hella's disapearance and the strange face of Marie (make-up around her eyes and lips + white white face) of her probable death.