my opinion: i saw that coming. The whole... thing with her head thing was unexpected, and unnecessary. The woman, after she died, looked like a doll. And if the man was so focused on watching the movie to ask her to turn her phone off, why did he take the time to use her head while the movie was playing after he killed her? Also, those other occupants aren't very aware of their surroundings are they? Plus, if he had actually killed her, she would have screamed louder and gone limp, pressing più than the 'a' button on her phone. and that was really bright for a movie theater.
it was actually poor directing and screenwriting. There could have been details edited to make it better.
i saw a video like that. exept it was in india, they were is an ally, and these two guys couldnt get the women to buy from their shop. so theyshot her once in each hip, stripped her down, and each guy stuck his dick in each of her hips, and seamen went out her vagina. they didnt mostra her body parts, they kept the camera above them, o under them.