Okay , so here it is:

Follow these steps:

1. In Photoshop, FLIP the card HORIZONTALLY.
2. In Photoshop, INVERT the colors.
3. Overlay the flipped/inverted card over the Google map image of the Sandy Hook Elementary School.

You get:

:sandieg:

You will notice a few strange coincidences:

1. The glove has four white patches for the fingers , which matches the four white patches of the four projections of the school towards the NE part of the image.

2. The parallel notches on the gun look similar to the cars parked parallely in the car park.

3.The blue hand touching the gun toward the North of the image has the edge of the palm almost mirroring the curve of the road leading away from the school toward North.