Above is a still picture of our killer, he is walking in a park with his hands in his pocket and his head down. The image below is showing the character Sam from AdULTHOOD, as you can see he is also walking with his heads down and his hands in his pocket, these little actions suggest to us that they are
Sly and Quiet
They are both walking in a place where there are grass, Sam is walking in a graveyard whilst our killer is walking in a park. Although I listed 'DARK CLOTHING' as a stereo type for killer, Sam wears a grey 'hoodie' but hides his face with a hood just like how our killer looks down to hide his face.
All this represents one particular social group.
The Modern Teenage Trouble Makers known as "Yobs"