James Bissell-thriller opening 2

The sequence starts with a couple walking through a park chatting to one another when the man's phone rings, he answers the phone to a women he tells him that she is watching them. The man looks around in fear and then asks who it is. The women then reveals to the man that she knows what he has done and that his girlfriend wouldn't want to know what that is. The man tells her to leave him alone and hangs up the phone. As soon as the man does this his phone rings again with the same number, he quickly hangs up and phones his friends at the police station as the man is in the police force. However before he can put down the phone someone hits the man from behind right on the head, the women screams but is then smothered before the scene is cut to the end credits.