Regarding the twist, watching the trailer, I suspected that it might all be in her head but never would’ve predicted this is how

. Honestly, it was a pretty fun twist and it was handled really well. Lots of cool clues for you to figure it out like how her head starts bleeding again after each murder, when you first realise that Gabriel is actually moving backwards, and that scene at the police station where she talks to Gabriel on the phone and you see her head in the mirror behind her. I thought that scene was great foreshadowing. You do figure it out before the movie actually tells you but that’s fine and it doesn’t make it any less fun.