Narrative of preliminary task

In the trailer,Elly will be walking through the Forrest on her phone. Elly is walking through the Forrest while Leah is watching and following Elly. While Elly is walking,she hears a noise behind her and turns around to see Leah behind her. Elly freezes and Leah walks up to her.The nest thing the trailer shows is Elly coughing up blood after Leah has murdered her and the final scenes of the trailer show Leah picking up the camera and staring into the camera.