this movie be essentially shoot on a hand hold camera by the actor in it . in some way a mockumentary in other way a video diary from killer it be full on account of a columbine style attack . while this movie do not answer all the big question and it do give you an insight into how easy it would be to get away with . through the movie you be show how the actor illegally shorten shot gun and make pipe bomb and come up with an action plan for zero day . the actor ( if you can call them that ) be brilliant and they obviously borrow heavily from there own life and but at no stage do i detect them really act ( something tom cruise should try ) . the use of the cctv and the 911 operator at the end be genius and but i be not sure if we need the very last scene . overall though a really good movie on a very tough topic .