Final Idea

The Chase

• Starts off with one character running up the stairs in a stairwell, the character is constantly looking back over his shoulder.
• He doesn't see the person in front of him with some shopping bags and runs straight into them, making them stumble, dropping the contents of the bags on the floor and down the stairs.
• The runner looks at the person, gesturing a sorry face, but keeps on running up the stairs, until he reaches the roof exit door.
• The runner comes out of the door, checking over his shoulder anxiously, he keeps running until he reaches the end of the rooftop, he looks down, the height scares him causing him to take a stumbly step back.
• The runner then hears a loud bang, so he looks behind and sees the guy that's been chasing him standing at the rooftop exit door. The guy looks at the runner intensely and then starts running towards the runner.
• So the runner takes a few steps back, takes a deep breath looks back at the guy chasing him and then starts running towards the end of the roof, Jumping across. (dramatic and slow motion)
• The runner makes it across diving into a forward roll on to the next roof top.
• The runner gets up and looks back at the guy and does a little sarcastic wave, and walks to the end of the rooftop.
• The other guy looking angry muttering and jabbering under his breath at the runner.
• The runner carefully climbs down the fire escape from the top of the roof, and gets down to the pavement looking all smug with himself.
• The runners doing a little happy walk along the street, until he comes to the corner and the chaser guy walks out in front of him.
• The guy stands there and intensely stares at him for a few seconds, until he raises him arm to the runner, then quickly taps him on the shoulder and shouts "TAG" and runs off in the opposite direction.
• Leaving the runner being like "nooooo" in a dramatic way. 

(Style)

For the style I wanted it to be set in New York, and have the tall building's with the fire escapes running down the front of the building. I've put a collage/mood board together of some rooftops that I like.

And below is a collage of a few images I found on the internet, mostly from from Tumblr and Flickr, there quite rural and abandoned stairwells and cold and made from concrete.

Some more stairwell collaging, more warm and inviting than the last one.