No, the boy didn't shoot the man, but that's the way it's suppose to appear. This is mostly a Nuke 6 (yes, the new Nuke) composition, so I'm using some of the newer features.
In this case, the scene was lit for the interior exposure, highlighting the boy and man, causing blown out windows. They where replaced with normally exposed versions using the new RotoPaint tool (which is awesome), coupled with a small blur.
After the windows where replace, the man was rotoed over the image. The roto was done in eight sections, with lots of featuring and motion blur to compensate for the natural blur of the scene.
At the end of the shot, you see a pair of hands catching the talent as he falls. These needed to be removed. The right hand was cloned out on a frame by frame basis. However, for the left hand, a patch from a prior frame was used since there wasn't enough local material to clone from.
Titles and color grading was created in After Effect, with the compositions being composed in Premiere Pro.
The Nuke 6 script is at the end of the footage.