Revised Thriller Plot - 'Out Of The Blue'

Male Character (Billy) is on a walk around a lake taking photographs

As Billy passes down a it is now apparent to the audience that he is being watched from afar by a female character (Danielle)

Billy is oblivious and continues down the path

He crouches down to prepare to a take a photo. 

(We then cut to) Billy standing up again after taking the photo whilst Danielle can be seen in the background watching

As Billy continues further down the path way around the lake, Billy's focus remains largely on his camera and his photography and not his surrounds. 

Billy bends down besides the river to take another photograph

Danielle, out of sight of Billy, then picks up some blue rope

She then tightly puts the rope around Billy's neck and pulls back.